about us is an internet news media organization:
the international greenroof & greenwall industry’s resource and online information portal.

Our Goal is to inform, promote and inspire the earth friendly technology of organic greenroof architecture through the interchange of ideas, projects, news, video, travel, research, organization and government updates, marketing opportunities and exclusive features via our website.  We recognize that each reader, project, and perspective is unique.

Our Mission is to facilitate information, and as “The Greenroof Industry Resource Portal,” serves an important role as the information database and clearinghouse for the greenroof movement worldwide.  Founded in 1999, the website continues to evolve to better reflect the needs and desires of our ever growing readership while continuing to provide an interactive platform of greenroof learning and varied living architecture philosophies.  We launched our news magazine-type format in May, 2003, and website-wide access is always free and unencumbered!  We love to push the limits and post articles from guest contributors and occasional guest columns along with commentary, book reviews, and exclusives from publisher Linda Velazquez.

Our Readership audience includes design and construction professionals, building stakeholders, decision makers, environmental consultants, government officials, students and homeowners interested in sustainable design and environmentally friendly architecture.

Join the greenroof and greenwall community by liking our Facebook page, following us on Twitter, linking with us on LinkedIn, share with us on Google+, subscribing to our GreenroofsTV channel on YouTube and our monthly eNewsletter via Constant Contact. is the Exclusive Publisher of the following:

The Greenroof & Greenwall Directory of Manufacturers, Suppliers, Professional Services, Organizations, Students & Green Resources.  Maximize your marketing strategy in the emerging international greenroof industry and reach our highly targeted greenroof market by listing your business with us!  Advertisers in The Greenroof & Greenwall Directory pay an annual fee for a Directory Listing which links to categorized listings, and their full page Company Profile (Sponsor, Elite, and Premium Listings only).

The Greenroof & Greenwall Projects Database.  Our goal is to compile a comprehensive body of global greenroof & greenwall projects searchable by type, date of completion, geographic location, designer, manufacturer, etc., all at no charge.  And, our goal is to be inclusive, not exclusive.  While an ambitious and time-consuming undertaking to be sure, with all the stake-holders' input we continue to make this a success.

Submit Your Greenroof & Greenwall Projects by using the easy online form in English, Spanish, or German.

As we all participate, everyone benefits from this potentially huge and important reference database of greenroof Projects worldwide.

Greenroofs & Walls of the World™ Virtual Summit. is the organizer and promoter of this biennial virtual event (2017, 2015, 2013, 2011). The Mission of the Virtual Summit is to inform, share, and create a global social media experience for learning and networking via the power of the Internet. In addition to raising awareness of our market and industry, the Virtual Summit is an interactive platform for the interchange of ideas through a combination of keynote speakers, expert panels, moderated chat sessions with live Q & A, on-demand presentations, plus live video chatting at the Sponsor Meeting Rooms, Networking Lounge, and the spectacular 24-hour Expo Pavilions showcasing vendors and organizations from across the world. is a video channel devoted to greenroofs and greenwalls from and across the globe. and are encouraging a loose network of Greenroof "Videographers" to submit their videos to us to be included on the greenroofsTV channel on YouTube.  Showcase your own experience and increase your exposure by sharing your interviews, tours, project visits, etc., here, and send us feedback!  If you are interested in sending us video, we ask that you sign-up for an account in YouTube - it's free and very easy.  After that all you have to do is upload your videos and send us an email when you are done.

Watch the many informative and lively videos from our 2015, 2013, and 2011 Greenroofs & Walls of the World™ Virtual Summits. You can also see our our short and fun "This Week in Review" video series on produced and hosted by Anjuli Velazquez through 2012, and our original WebTV series Sky Gardens - Greenroofs of the World™ hosted by Linda Velazquez here.

Sky Gardens Blog

Sky Gardens Blog ~ where cool green meets lofty blue.  In 2008 founder and publisher/editor Linda Velazquez entered the blogosphere and kicked off Sky Gardens ~ a blog about greenroofs, the living roofs community, and awesome sustainable design in general from her, our contributing editors, and guest bloggers.

Visit Sky Gardens for a look into our personal takes on the living architecture world.

Personalize your desktop with our new 2015 Wallpaper Projects Gallery - our gift to you! This collection of rotating desktop backgrounds— wallpapers—makes it easy to keep your PC or Mac in tune with your mood. From beautiful greenroofs to breathtaking greenwalls from all over the world—find an image, or all of them, that moves you and make it yours to enjoy at home and work. offers the following Exclusive Features:

The Greenroof & Greenwall Projects Database
Peruse the multi-searchable fields of the international Greenroof & Greenwall Projects Database.  Submit your greenroofs and walls as case studies and become a part of our international reference. 

Guest Feature Articles
Read the submissions of personal stories, opinions, and viewpoints on a range of subjects pertaining to the greenroof industry (no "advertorials").

Contributing Editor Columns
Read these lively occasional columns from experts in their fields - read about these wonderful people below and send us your questions.

Top 10 List of Hot Trends in Greenroof & Greenwall Design
Greenroofs and walls are fast becoming green staples of chic sustainability in mainstream architecture and high performance building with a hip environmental sheen that is attractive to young and old.  And we all know that greenroofs are vibrant and exciting alternatives to the average unused, hot, and often downright ugly black tar or concrete roofs that we see covering the world, but what and where are the new and exciting projects on the boards?  How about the newest darling, greenwalls?

Enter the Top 10 List of Hot Trends in Greenroof & Greenwall Design to showcase the important, newsworthy and stimulating projects from around the world!  Our Design Editor Haven Kiers and Publisher/Editor Linda Velazquez inaugurated the series in 2007 and continue this fun yearly endeavor.

Sky Gardens  ~ Travels in Landscape Architecture is the basis of the Sky Gardens Blog – Publisher Linda S. Velazquez’s former column with a view of her unique perspective of the world, highlighting a different U.S. or international city active with greenroof projects and people.

Upcoming Events
Upcoming Events is a huge database of
a variety of seminars, workshops, conferences and other public events that address green building, green living, and the greenroof concept, presented with contact information for the respective organization, as well as highlights of relevant Past Events, where we have Archives of Upcoming Events from 2001 - Present.

Stay up to date with these sections for specific industry related updates:

Industry News
Get your news from companies, organizations, governments and universities.

Industry Support
Learn what governments are offering incentives, grants, policies and programs designed to promote green architecture and the public.

Research Links
Research Links informs you of current greenroof sources and studies being conducted by universities, private companies, and public or governmental affiliates.

Search for or post your job and internship openings/wanted here for free!

The Student Directory, Student
Feature Articles, Projects & more
A place where students involved with greenroof pursuits can post projects and papers, and make contacts with other students and companies.  Send Christine Thuring, our Research (formerly Student) Editor, your comments and suggestions.

Greenroofs 101
Greenroofs 101 is a sub-web of its own and our most popular section.  It is lengthy, holding the nuts and bolts information about the earth friendly technology of organic greenroof architecture.

This is Linda's original website and independent study paper designed to be a living research document. We update this section often as new findings and ideas emerge.  Read all about greenroofs here, including: FAQ's; Concept; Advantages; Components; How To's; Bibliography; Plant Lists; Applications; and Issues.

The International Greenroof & Wall Directory
Search through six Category Sections to locate greenroof professionals & materials in your area or around the globe, searchable by multiple fields.  Maximize your marketing strategy in the emerging international Greenroof & Greenwall Industry and list your business with us.

The MarketPlace
Do you have a product or accessory related to extensive or intensive greenroofs, roof gardens, sod or earth-sheltered homes? Then you can advertise it in the greenroof depot. You can search the You can search the greenroof bookstore for books, magazines, design guides, conference materials, and calendars dealing with greenroofs and issues of ecological and sustainable design.

Regarding advertising practices - in an attempt to stay consistent with our environmentally friendly mission and goals, we will make every effort to screen our advertisers carefully.  But we also believe in an open market and our readers' right to make an informed decision and choose their own professionals and product suppliers.



About The Principals:

Linda S. Velazquez, ASLA, LEED AP, GRP, is publisher and editor of (1999) and is the author of its original content.  She is also the designer and overseer of The Greenroof & Greenwall Projects Database, a project near and dear to her heart.  She has a Bachelor’s of Landscape Architecture degree from the University of Georgia (2000, cum laude) and an Associate of Arts in Business Administration (1982).  She heads up the Sky Gardens Blog ~ where cool green meets lofty blue.  “Cool green?”  Cool green architecture, cool green people, cool green environments, etc. - you get the picture. “Lofty blue?”  As in sky high spaces, places, ideals, and ideas.

Linda organizes and hosts the biennial Greenroofs & Walls of the World™ Virtual Summits and she is a greenroof design consultant - the principal of Sky Gardens Design.  When not too busy writing, editing, designing, and visiting projects around the globe, she presents on greenroofs all over the world.  Linda is also a mom of three and was an international flight attendant for 33 years, having retired from Delta Air Lines in September, 2012.  She produced and hosted the Sky Gardens - Greenroofs of the World™ WebTV series (2008-2009) which featured one spectacular greenroof and then examined project and city stakeholders involved in the design process; this remains an open project she continues to pursue.  Linda lives in Alpharetta, Georgia with husband and partner Aramis, and the occasional grown "children" who keep coming back every now and then.

email: linda (at)

View Linda's Profile


Aramis M. Velazquez is the CEO (Chief Everything Officer) of, LLC (1999).  Aramis has an MBA from Keller Graduate School of Management and a B.S. in Industrial Engineering from Florida International University, with a strong Engineering, Information Technology & Accounting background.

Aramis handles all the operations in, LLC, which includes Sales & Marketing, Social Media, Web Development, Information Technology, Accounting, Billing, Customer Service, and whatever else Linda does not want to do.  He is also the News Editor and administrator of The Greenroof & Greenwall Directory.

email: aramis (at)

View Aramis' Profile


Ari Velazquez is the developer, 2003 - current), of The Greenroof & Greenwall Directory, the developer and administrator of The Greenroof & Greenwall Projects Database, and the lead designer for the new website, in construction.

Ari graduated from the Georgia Institute of Technology (Georgia Tech) with a degree in Computational Media (video game design) in 2010.  He's the youngest of Linda & Aramis' three kids and lives in San Francisco as a web developer and video game designer. 

email: ari (a)

View Ari's Profile


Anjuli Velazquez is the Associate Producer, 2008 - current, of our page, the greenroofsTV channel on YouTube, and the Sky Gardens ~ Greenroofs of the World™ WebTV series.  She also wrote, filmed and produced our weekly "This Week in Review" video series which ran from 2011 to 2012 on

Anjuli graduated in 2010 with a degree in Bachelor of Arts in Interdisciplinary Studies with a Minor in Women's Studies from the University of Central Florida and in 2013 completed a certificate in Video Editing from the Art Institute of Atlanta.  She produces AnjuliTV and wants to pursue her career in television and film production.  Anjuli is Linda and Aramis' middle child and lives in Alpharetta, GA with her son, Nicky.

email: anjuli (at)

View Anjuli's Profile


Joseph Velazquez is the Director of Media, 2012 - current.  He produces short videos including the "Project of the Week" and "Company of the Week" series. Joey also oversees the development and final product of the Keynote Speakers and Panel Conversation videos featured in the biennial Greenroofs & Walls of the World Virtual Summits. From 2008 - 2010 he directed the Sky Gardens ~ Greenroofs of the World™ WebTV series.  He has also served as Senior Aide, 2016, and Senate Aide, 2015, for the Georgia General Assembly working for Senator Jack Hill.

Joey will graduate in 2017 from Georgia State University, Summa Cum Laude with Advanced Honors distinction, majoring in Political Science with a Pre-Law Concentration and minoring in History; he will enter law school in the fall of 2017. Joseph is the oldest of the Velazquez children and currently lives in Alpharetta.

email: joseph (at)

View Joey's Profile

We are proud members of the following associations:

American Society of Landscape Architects
Georgia Chapter Member (GASLA)

Green Roofs
for Healthy Cities

Corporate Member

U.S. Green Building Council
Atlanta Chapter

Industry Collaborator

Southface Energy Institute's Network banner

These are our Guest Contributing Editors, in order of coming on board, who graciously provide unique insights in their field of expertise without compensation (affiliations are given for identification purposes only):

Ed Snodgrass

Ed Snodgrass is our Plant Editor (2004).  He writes a very occasional Q & A column entitled "Ask Ed" where he answers your plant and horticulture questions, and also contributes an occasional Plant Feature, which highlights a particularly interesting and useful greenroof plant.

Ed is a Horticultural Consultant and co-owns and operates Emory Knoll Farms, a perennial nursery specializing in green roof plants, currently stocking over 100 varieties and providing over 2.5 million sf of planted roofs.  In 2010 Ed co-authored his latest book The Green Roof Manual: A Professional Guide to Design, Installation, and Maintenance with Linda McIntyre, published by Timber Press.  In 2006, Ed, along with Lucie Snodgrass, co-authored Green Roof Plants, A Planting and Resource Guide, published by Timber PressLocated in Street, Maryland, Ed lives as lightly on the Earth as he can.

email: ed (at)

View Ed's Profile

Glam Christine Thuring

Christine Thuring is our Research Editor (formerly Student Editor,  2004) and, in addition to her biannual newsletter "Green Roofs on the Curve" and "Christine's Ramblings," she also writes occasional Exclusive Features and Blog posts.  With a background in plant ecology, Christine Thuring has been focused on green roofs since 2001.  She has a MSc from the Penn State "Centre for Green Roof Research" (2005) and is currently a PhD candidate at the University of Sheffield.  As a Contributing Editor for, she responds to queries and enjoys connecting people and interests.  Sign up here to receive her occasional Ramblings and Newsletter.

In addition to research, Christine has represented green roofs in terms of education and communication, ecological design and consulting, and German-to-English translations (learn more).  She is best defined by Chlorophyllocity, through which her many interests and activities are represented.  From collaborative design projects to applied research, translation, and study tours (Green Roof Safari), her mission is to facilitate and support humanity's transition from the carbon to the ecological age.  A multi-lingual citizen of the world, Christine enjoys rail travel, loves bogs and spring wildflowers, and rides her bike everywhere.

email: christine (at)

View Christine's Profile

Kelly Luckett, LEED AP, GRP, is "The Green Roof Guy." He fine-tuned his editorial focus and inaugurated his new column of the same name in April, 2008.  Formerly "The Roving Exhibitor" (2005), he wrote about his experiences at green building conferences as President of Green Roof Blocks.  As president he still is a frequent trade show exhibitor at greenroof and green building conferences - but Kelly also roves around the country attending ASTM, GRHC and other roofing and greenroof related organization meetings, and has become a central figure here.  In fact, in November, 2010, Kelly was selected to receive the Green Roofs for Healthy Cities Civic Award of Excellence in recognition of his contribution to the green roof industry.

In 2009, Kelly authored Green Roof Construction and Maintenance, published by McGraw-Hill's Greensource.  Look for The Green Roof Guy's column about his experiences and impressions within the greenroof industry as just a regular (green) roofing guy from St. Louis, Missouri, where Kelly lives with his wife, son and daughter.  So read his column to stay up to date within the greenroof industry!

email: kelly (at)

View Kelly's Profile

Patrick Carey

Patrick Carey, GRP, is our Architecture Editor (2005).  He writes an occasional architectural column entitled "A View from the Sky Trenches," where he selects and discusses pertinent greenroof industry topics.

Patrick has a degree in architecture and lives in Chicago, Illinois, principal of hadj design, a green roof design-build company.  Patrick was director of the Northwest EcoBuilding Guild's Green Roof Project in Seattle for years.  PKC is also a trainer for the Green Roofs for Healthy Cities' Green Roof 101,  201, 301, & 401 Courses.

email: patrick (at)

View Patrick's Profile

Haven Kiers, MLA, LEED AP, GRP, is our Design Editor (2005).  She writes an occasional column entitled "Chic Sustainability," and co-writes and co-presents the "Top 10 List of Hot Trends in Greenroof & Greenwall Design" series with Linda.  She feels the "Greenroof challenge lies in finding the right balance between idealistic principles and cutting edge design."

Haven is a Mom and lives and works in Davis, California, with her husband, daughter, and son.  Haven is a lecturer in landscape architecture at UC Davis and the special projects manager at the UC Davis Arboretum.   She has worked as a landscape architect, a city and environmental planner, and a consultant.  Haven designs and presents nationally about greenroofs and other green infrastructure, and is also a trainer for the Green Roofs for Healthy Cities' Green Roof 101, 201, & 401 Courses.

email: haven (at)

View Haven's Profile

Christopher Wark is our Energy Editor (2010) and writes about Energy & Green Roofs.  In April, 2011 he completed his seven-part series entitled "Cooler Than Cool Roofs: How Heat Doesn't Move Through a Green Roof."

Christopher Wark has 26 years of multidisciplinary engineering experience providing technical and analytical support for manufacturers, universities and national labs. For the past 12 years, he has focused his efforts on technical solutions in building design and is currently an Associate with BuroHappold Engineering, managing the Analytics group in their New York office.

In 2002, Chris established SHADE Consulting/Green Roof Innovations with his wife Wendy. With SHADE, Chris developed and marketed several innovative modular eco-roof systems, a roof system heat transfer and cost computer program, and conducted green roof system heat transfer analyses for 5 major cities and organizations. In 2010, he developed a modular planting system in partnership with Guiyang Chuangjia High-Tech Accelerator Co. LTD in Guiyang, China.

Chris has also been involved in other thermodynamic related work at Caterpillar Inc., Lawrence Livermore National Lab and 2 private research laser development companies. He has presented at numerous conferences, has several articles published on a wide variety of engineering topics, and has had the privilege of working directly with several universities, including Stanford’s Center for Integrated Facility Engineering (CIFE) program.

Chris holds Bachelor’s and Master’s of Science degrees in Mechanical Engineering from Washington State University where his graduate work focused on thermodynamics, fluid dynamics and combustion. 

Chris launched his P-Pod by Ponix campaign on Kickstarter.  Support him and read about it here.  He lives in Manhattan, New York with his wife.

email: chris (at)

View Chris' Profile

Kevin Songer, J.D., LEED AP, is our Tropical Green Roof Editor (March, 2012).  Kevin serves as tropical, coastal and hurricane green roof expert for MetroVerde, a Florida based vertical green design company.  He was awarded the 2012 City of Jacksonville's Environmental Protection Board's Christi P. Veleta Award, 2011 'Green Hero' of the year award, and the 2009 Innovation in Landscape and Water Conservation recognition by the Northeast Florida Chapter of the USGBC.  Kevin has spoken of the economic and ecological benefits associated with green roofs at numerous functions and seminars.  Watch his "Coastal Green Roof Design and Native Plants" video from our Greenroofs & Walls of the World™ Virtual Summit 2013.  And he served on’s "Wind. Water. Heat. Grow. Greenroofs."ť Panel Session with Dr. Bill Retzlaff, David Aponte, and Joe Webb during the 2011 Greenroofs & Walls of the World™ Virtual Summit.

Kevin writes a daily green roof blog, Living Green Roofs, is presently designing several oceanfront green roofs, just completed design work on the first Green Roof in Bermuda, is an Aortic Dissection survivor, and contributes green roof notes to the Native Plant and Wildlife Garden web project. Kevin also holds an undergraduate degree in biology and the Juris Doctor degree from Florida Coastal School of Law with a focus in environmental law.  Kevin lives in Jacksonville, FL with his wife Judy.

Kevin's Social Networks: - introduction to green roofs & urban green - mobile site for tablets and phones - all things green roofs blog - green roofs & urban greening
Google +
Green Roof Plants:
Green Roofs & MetroVerde Tweets:
Green Roofs & MetroVerde on Tumblr:
Green Roofs & MetroVerde on Pinterest:

email: kevin (at)

View Kevin's Profile

Jörg Breuning

Jörg Breuning, the Green Roof Patroller (February, 2013), was born in "the green roof capital of world."  He began working with green roofs in Stuttgart, Germany in 1980.  Since then, he has installed and maintained tens of millions of square feet of green roofs throughout the world.

In 2003 Jörg transferred his German company (founded in 1985) to the United States after being the key consultant for Chicago’s City Hall green roof.  His company, Green Roof Service LLC - Green Roof Technology has introduced numerous innovations to the North American green roof industry.  Jörg’s articles will strongly focus on topics that ensure common sense is always practiced, ensuring that the horse stays in front of the cart, and provide valuable insights into making green roofs as popular and efficient as they are in Europe.

email: jorg (at)

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Joy Schmidt writes "On the Road with the Green Roof Lady" (October, 2013).  Fondly known as "The Green Roof Lady" Joy was initiated to the industry 20 years ago, inventing green roof systems and educating the global marketplace alongside Wolfgang Behrens, literally from scratch.  Joy is owner and President of Vitaroofs International, Inc.  The company is a rebranding of the green roof business that she owned and operated for the past 11 years, under the Xero Flor Canada Ltd. label.  Prior to working and living in Canada, Joy played a key role as part of the green roof movement in Germany as Project Manager at Wolfgang Behrens System Development.

1,000 green roofs later, she’s personally been involved in some of North America’s most celebrated projects, including the Ford Guinness Book of Records River Rouge Plant and the Vancouver Olympic Village.  Joy’s contributions have extended to accredited programming for architects, government task forces and research and development with National Research Council Canada (NRC), Michigan State University, St Mary’s University, UBC-O, SAIT Polytechnic and BCIT.  She’s also been published as a leading expert in The Rise of Living Architecture.

Change aside, Joy still packs her fleece and hard hat to climb up those construction sites, no matter the weather!  She also remains steadfast in her commitment to do the right thing, especially when it makes good business sense.

email: joy (at)

View Joy's Profile

Steven L. Cantor is the "Landscape Editor" (December, 2013).   In February, 2015 he completed his 14-part series "A Comparison of the Three Phases of the High Line, New York City: A Landscape Architect and Photographer’s Perspective."

Steven is a registered Landscape Architect in New York and Georgia with a Master’s degree in Landscape Architecture from the University of Massachusetts, Amherst. He first became interested in landscape architecture while earning a BA at Columbia College (NYC) as a music major.  He was a professor at the School of Environmental Design, University of Georgia. During a period when he earned a Master's Degree in Piano in accompanying, he was also a visiting professor at the College of Environmental Design at the University of Colorado Boulder. He has also taught periodically at the New York Botanical Garden (Bronx) and was a visiting professor at Anhalt University, Bernberg, Germany.

He has worked for over three decades in private practice with firms in Atlanta, GA and New York City, NY, on a diverse range of private development and public works projects throughout the eastern United States: parks, streetscapes, historic preservation applications, residential estates, public housing, industrial parks, environmental impact assessment, parkways, cemeteries, roof gardens, institutions, playgrounds, and many others.

Steven has written widely about landscape architecture practice, including two books that survey projects: Innovative Design Solutions in Landscape Architecture and Contemporary Trends in Landscape Architecture (Van Nostrand Reinhold, John Wiley & Sons, 1997). His most recent book, Green Roofs in Sustainable Landscape Design, (WWNorton, 2008), provides definitions of the types of green roofs and sustainable design, studies European models, and focuses on detailed case studies of diverse green roof projects throughout North America. In 2010 the green roofs book was one of thirty-five nominees for the 11th annual literature award by the international membership of The Council on Botanical & Horticultural Libraries for its "outstanding contribution to the literature of horticulture or botany." He has been a regular attendee and contributor at various ASLA, green roofs and other conferences in landscape architecture topics.

email: steven (at)

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Kevin Falkerson & Kerrie Lee Cole contribute The Symbiotic Report (June, 2014).  Kevin Falkerson is founder, designer, and principle of SYMBIOS ecotecture: A design/build company focusing on integrating the ‘built’ with the ‘biological,’ with the overall aim of developing a positive symbiosis between human culture, enterprise and the natural environment.  Located in Sonoma County, California, their integrated approach offers design, installation and maintenance services for both residential and commercial vegetative roof projects, specializing in architectural detailing, green roof technologies and landscaping.  "The design of buildings interacts with the world by transforming the natural patterns, energies and life of a place.  Designing with this in mind, our buildings mimic the biodynamic quality of natural systems instead of the typical expression of static opposition.  Natural structures are biodynamic forms.  The natural forces interacting upon a physical body have in part shaped its expression.  Eco-tecture looks to express its form as an adaptation to its locale (site) and its associated environmental forces.  At SYMBIOS, the natural features of the bioregion and local site ecology become a source of inspiration for our designs."

Kevin earned a degree in Ecology from Hampshire College and a Master’s of Architecture degree from Rensselear Polytechnic Institute (RPI).  He  also holds a GRP (Green Roof Professional) accreditation from Green Roofs for Healthy Cities.  He writes an online newsletter entitled ‘News from the Eco-frontier’ and lectures on multiple topics related to living architecture.

Kerrie Lee Cole leads the vegetative building division of SYMBIOS and has gained the accreditation of a GRP - Green Roof Professional.  Her path has always been one associated with living plants.  Initially trained in herbalism followed by horticultural studies and employment in the landscape industry, she naturally gravitated towards working with living vegetative building systems.

email: symbiotic (at)

View Kevin's Profile

Former Guest Contributing Editors:

Caroline Menetre Totten (1956-2016) was our student intern from 2008 - 2009 and collaborated with us for several years afterwards.  Caroline graduated in 2009 with a second degree in Environmental Horticulture at North Metro Tech in Atlanta with a specialization in Sustainable Urban Horticulture.  Her first degree was in Commercial Art. Previously, she was employed for 20 years as art director with one of Northwest Florida's most established and successful advertising agencies.

Keenly interested in greenroofs and greenwalls – and combined with years of experience in advertising and editorial publications – Caroline helped grow
The Greenroof & Greenwall Projects Database; headed up the new design of our 2011 Greenroofs & Walls of the World™ - 12 Month Wall Calendar; and also helped design the look of our blog, Sky Gardens ~ where cool green meets lofty blue, among other projects. More recently she had been an independent landscape designer, environmental horticulturist, and local organic garden manager. She was a dear colleague who will be greatly missed by all; read more at In Memoriam: Caroline Menetre Totten.


George Irwin was our Green Wall Editor (2008) and wrote "The Green Walls Column."

George is President of Green Living Technologies International, LLC, a company that manufactures and designs Green Living™ Walls & Green Living™ Roofs in addition to other Green Living™ Accessories.  He is a former trainer for the GRHC Green Walls 101 & oversees additional green wall research with various higher educational facilities in the U.S. and abroad.

George lives in Rochester, New York with his wife, son and daughter.  In his spare time he is still an avid gardener he also enjoys travel and lecturing.

email: george (at)

View George's Profile

Ralph Velasquez is a "Sustainability Champion."  Watch Ralph’s Keynote Video “CSR, Corporate Social Responsibility – The Who, What, Where, When and How” from our inaugural 2011 Greenroofs & Walls of the World™ Virtual Summit on our GreenroofsTV channel on YouTube.

Ralph contributed the occasional column "Perspectives from the Green Boardroom" (2011).  He was also our former Sustainable Roofing Technologies Editor. 

In April 2008 he inaugurated his updated column "Sustainable Roofing," changing his previous editorial focus when you knew him as the ASTM Editor (2005).  He then wrote a quarterly "ASTM Update" as a member of the American Society for the Testing of Materials Green Roof Task Force (E.06.71.07), part of the sub-committee for Sustainability (E.06.71), which in turn is part of the committee for Performance of Buildings (E.06).

Ralph is the former Executive Director of Sustainability with Tremco Inc.  Ralph lives in Nashville, Tennessee with his wife.

John Shepley is our former Green Business Editor (2011) and contributed "Sustainable Business Insights."  Watch John’s  Video "Sustainability at a Small Business: Emory Knoll Farms" from our inaugural 2011 Greenroofs & Walls of the World™ Virtual Summit on our GreenroofsTV channel on YouTube.

John has worked as an engineer, technical manager, business manager, and management consultant.  Since 1984, he has lived and worked in Baltimore and surrounding areas, with a couple of years in Copenhagen Denmark building a new metro system there.  In 2004, John co-founded Emory Knoll Farms, Inc. in Harford County.  Emory Knoll Farms grows plants exclusively for green roofs.  In addition to serving the green building industry they operate a socially just and sustainable business. 

John is a founding board member of the Baltimore Biodiesel Cooperative (2004-2009), and has served on the board of the Chesapeake Sustainable Business Alliance since 2006, where he has been chairman since 2009.  John is passionate about renewable energy, sustainable living and business, and promoting a living local economy.  He drives a vegetable-powered truck, and has an electric Mazda RX-7.  

John has a Bachelor’s Degree in Electrical Engineering from West Virginia University, 1984.  He lives in Glen Arm, Maryland with his wife, stepson, and two dogs.

Dr. Bill Retzlaff

Dr. Bill Retzlaff is the former G.R.E.E.N. Editor (2006).  He wrote a bi-annual column entitled "The G.R.E.E.N. Research Report."  Dr. Retzlaff is the research coordinator of the St. Louis metropolitan area research collaboration G.R.E.E.N. - Green Roof Environmental Evaluation Network - between Southern Illinois University Edwardsville (SIUe), Green Roof Blocks, Jost Greenhouses, Midwest Trading and Horticultural Supplies, Inc., Midwest Groundcovers, JDR Enterprises, Emory Knoll Farms, Garick, The Gaia Institute, and

Bill Retzlaff, Ph.D. is an Associate Professor and Chair, Department of Biological Sciences, Environmental Sciences Program at SIUe, and lives in the St. Louis, Missouri area with his wife.


The opinions expressed by our contributing editors may not necessarily reflect the beliefs of, and are offered to our readers to simply present individual views and experiences and open a dialogue of further discussion, debate and research. 

Enjoy, and if you have a particular comment, please contact the author or send us an email to:  comments (at)


Publisher Acknowledgements – quoted from Linda S. Velazquez in 1999 while a fifth year undergraduate student at the University of Georgia – but still relevant today:

“Landscape Architecture Magazine’s May 1998 article by J. William Thompson spurred me on to conduct the original UGA research paper that eventually turned into this website.  I had seen greenroofs throughout Europe, but not in the U.S., and wondered why we, as landscape architects, weren’t yet interested in this fascinating, ecologically sound, design possibility. I took Mr. Thompson’s advice to “seek out the most up-to-date information available and to become a leader of greenroof technology.”  Research through an independent study program made sense to me as most professors had only a vague idea of what greenroofs were all about.

Charlie Miller, P.E. of Roofscapes, Inc. has been very helpful in providing me with so much of his greenroof stormwater research and information.

Tom Liptan, ASLA, has shared his thoughts and personal experiences with me and provided me with many of my initial leads.

Katrin Scholz-Barth, environmental and civil engineer, has been very open to assisting me with engineering tips and plant selection for my Senior Project.

Dr. Michael Krebs, Sales Manager and Walter Hussong, Civil Engineer at Optima in Tornesch, Germany, were very hospitable during my visit to their headquarters in March 1999.  They provided me with invaluable insight from the tour of the offices.

Kevin Burke, AIA, of McDonough + Partners has assisted me greatly by providing me with background information regarding their Gap Headquarters project as well as manufacturer product information and comparison studies.

Dr. Jeffrey C. Luvall of NASA’s Global Climate and Hydrology Center at the Marshall Space Flight Center in Huntsville, Alabama sent me a ton of fascinating information on the urban heat island situation.

A special thanks goes to a professor of landscape architecture at the University of Georgia, Kwesi DeGraft-Hanson, for encouraging my interest in greenroofs.” - LSV