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GBCI Canada Board of Directors

GBCI Canada’s five Board members were chosen for their green building leadership and expertise, as well as their ability to complement GBCI Canada’s business objectives.

Brian Denney

“I am very pleased to be on the Board of GBCI Canada, because I believe that at this time the green building movement is the most effective mechanism in the world to address the climate change threats that will have massive consequences for future generations. Canada has provided strong leadership within the green building movement and I am honoured to be part GBCI's efforts to make all buildings better.”

Taryn Holowka

“I am honored to serve on GBCI Canada’s Board of Directors. The exponential growth of green building in the US and internationally is inspiring and I look forward to helping deliver enhanced services and support a broad range of green business tools and programs throughout Canada.”

Jonathan Westeinde

“I am participating because I think GBCI Canada can play an important part in meeting the urgent need to demonstrate that the built environment can create places where people live happy, healthy lives within the planet's needs — profitably.”


Brian Denney, former CEO of Toronto and Region and Conservation Authority (TRCA) and former CaGBC National Board member

Brian Denney graduated from the University of Guelph in 1974 with a Bachelor of Science in Engineering with a major in Water Resources Engineering. He commenced work with the Toronto and Region Conservation Authority (TRCA) in 1974 and remained with the TRCA in various positions of increasing responsibility. He became CAO of the organization in 2003 and CEO in 2012. He completed his career at TRCA in December of 2017.

Under his leadership the TRCA offered broad programs in resource conservation and sustainability. The scope of programs and projects included working with developers of new communities to have appropriate regard for natural hazards and to contribute to the regional greenspace system while providing appropriate storm water management controls. His efforts included leading the organization in diverse programs ranging from heritage conservation to climate change mitigation and adaptation. Under his leadership TRCA created many new parks and trail systems along the Lake Ontario waterfront and throughout the valley and ravine systems of the GTA.

He led TRCA’s major contributions to the establishment of the Rouge National Urban Park. Efforts to advance the green building movement throughout the Toronto region was one of his major objectives and he was able to serve on the national board of the Canada Green Building Council for 6 years. His work has been recognized by awards from the Canada Green Building Council and from Sustainable Buildings Canada.

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Lachlan MacQuarrie, Vice President, Real Estate Management, Oxford Properties Group

Lachlan recently joined Epic Investment Services as Senior Vice President, Real Estate Management (National). Lachlan oversees Epic’s Canadian real estate management services team with accountability for its national operations, leasing, customer experience, sustainability, and innovation programs across its portfolio. Lachlan has 20+ years of real estate experience, broadly focused on operations, investments, development, and asset management. Prior to Epic, Lachlan led Oxford Properties Global Platform Services function for the past 10 years focusing on the delivery of best-in-class efficiency, expertise, and governance across all asset classes within Oxford, along functional areas that impact operations, service, innovation, and customers. Prior to working at Oxford, Lachlan was the VP Asset Management at a private real estate fund and has also worked in acquisitions at a private US focused fund. Currently Lachlan sits on the Board of Yorktown Family Services and on the board of GBCI Canada, a joint venture between GBCI and CaGBC focused on certification of green buildings. Lachlan also sits on the advisory committee of the Rick Hansen Accessibility Certification program. Lachlan is married to a commercial litigator and has two daughters aged 13 and 15.

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Taryn Holowka, Senior VP of Marketing, Communications and Advocacy, U.S. Green Building Council (USGBC)

A skilled communicator, storyteller and multi-market brand strategist, Taryn Holowka brings 19 years of experience in building multinational brands. Currently the Senior Vice President of Marketing, Communications & Advocacy at the U.S. Green Building Council (USGBC), Taryn heads up all global marketing, communications and public affairs efforts for USGBC and its popular LEED green building program. She is also responsible for a variety of other B2B sustainability brands at the Green Business Certification, Inc. (GBCI), including PEER, SITES, Parksmart, GRESB and EDGE.

Taryn's core areas of expertise are strategic communications planning, messaging and product and brand management; project and people management; business development and analytics; emerging technologies; and leadership. She was also awarded PR News’ PR Person of the Year in 2008 and nominated for Marketing Executive of the Year in 2014.

Taryn holds a Masters in Liberal Studies from Georgetown University and a B.A. in Political Science from the State University of New York College at Geneseo. She has been a LEED AP since 2004. Prior to joining USGBC, Taryn worked at the National Environmental Policy Institute (NEPI) overseeing an EPA grant as part of the Clean Air Act. She also was at the Polyisocyanurate Insulation Manufacturers Association (PIMA).

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Peter Papagiannis, COO, Brookfield Global Integrated Solutions (BGIS) and former CaGBC National Board member

Peter Papagiannis is Chief Operating Officer at BGIS. In this role, he is responsible for delivery of Facility Management Services across BGIS globally, including supporting service teams covering Quality, Health & Safety, Risk Management, Environmental Management and Strategic Sourcing.

In addition to obtaining his CPA designation, Peter is a graduate of the Business Administration program at Ryerson University, and has over 25 years of experience in the corporate real estate industry with extensive experience in property and facility management, financial management, risk management and legal aspects of corporate real estate. Prior to joining BGIS, Peter held executive roles within the retail and real estate industries in both the public and private sectors.

Peter has participated on a number of Real Estate industry committees including his role as the Inaugural Chair of University of Guelph- Real Estate Program Advisory Board, and a past Board member & Treasurer, of the Canada Green Building Council (CAGBC). He currently serves as a Board Member of GBCI Canada.

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Jonathan Westeinde, Founder and CEO of Windmill Development Group

Jonathan is founder and CEO of the Windmill Development Group, one of Canada’s most well-known green building developers. Windmill has completed over $1B of developments since inception in 2003 with a strong pipeline of future projects in place.

Jonathan is specifically interested in creating alternative financing vehicles to embed sustainability into projects, and is a recognized leader in Canada for finding innovative solutions for conventional financing issues. This ingenuity has led to firsts in the green building industry, including innovative partnerships to create zero carbon district energy systems, energy services contracts to introduce geothermal, and green loans.

Jonathan’s most recent focus has been the creation of a comprehensive integrated solution to green existing buildings. The green building retrofit market is an area that represents potentially one of the greatest opportunities to make significant carbon reductions in North America.

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