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We are grateful that a number of noteworthy Canadians are supporting Tree Ottawa by agreeing to be Tree Ottawa Champions. Learn more about these great people below:

Diana Beresford-Kroeger

Diana Beresford-Kroeger is a botanist, medical biochemist who brings together ethnobotany, horticulture, spirituality and alternative medicine to reveal a path toward better stewardship of the natural world.  A resident of the Kemptville area, she is among the most prominent tree thinkers on the Planet.  Her books include The Global Forest, Arboretum Borealis and Arboretum America: A Philosophy of the Forest.


Michael Rosen

Michael Rosen is the President of Tree Canada, responsible for securing private and public partnerships, overall project management, governance and chief of Board and stakeholder relations. Michael brings more than 20 years of experience to the position. Michael was Vice-President of Tree Canada since 2002.  Previously he was a Stewardship Coordinator and Forester for the Ontario Ministry of Natural Resources where he received the Amethyst Award for his work especially during the 1998 ice storm.


Mark Cullen

Mark Cullen is Canada’s best known gardener connecting with over one million Canadians weekly through his many varied media outlets. Whether it is through his weekly CTV morning show segment, his many on-line postings or his numerous books, his personable style and topical information has captivated audiences and continued to garner him fans across Canada.  Cullen is known for his sense of social responsibility, actively participates in local, provincial and international developmental and educational programs.

Chris henderson

Chris Henderson is an Ottawa-based eco-entrepreneur.  He has led two of Canada’s most forward-thinking companies in the domains of clean energy, climate change, environment and sustainability.  Locally, Chris has headed several major business organizations across the City, and is very active with environmental initiatives from 1000 Solar Rooftops to the 3i Summit.  Chris will play a key role connecting Tree Ottawa Champions with the initiative.

Ed Lawrence

Head gardener to a 30 year succession of Canadian Governors General and Prime Ministers, for more than two decades Ed Lawrence has shared his encyclopedic knowledge of the horticultural world with callers to CBC Radio’s weekly noon-hour phone-in gardening show, one of the longest running and most popular segments in Canadian broadcast history. This veteran “Gardening Guru” has compiled the best of those queries and answers into practical, hands-on books about horticultural peril and redemption.


Owen Clarkin

Scientist, life-long naturalist, and current Chair of The Ottawa Field-Naturalists’ Club, Owen Clarkin’s interests involves the natural history of trees.  His focus has centered on the present status of natural forests in Eastern Ontario; in this capacity he has been looking for the last “unknown” remnant woodlots of the primeval forest, with an emphasis on understanding the conservations of rare or otherwise threatened species and habitats.



Avrim Lazar

Avrim Lazar was President and Chief Executive Officer of the Forest Products Association of Canada until 2012. Mr. Lazar has held senior policy positions in the government of Canada in the Ministries of Justice, Agriculture, Environment and Human Resource Development. He played a leading role negotiating the Boreal Forest Agreement between the forest products industry and environmental groups.


David Spence

David Spence is co-founder of the Wetland Preservation Group; founder and current director of the Friends of the Carp River; past chair of the West Carleton Environmental Advisory Committee; past chair and current member of the Ottawa Stewardship Council; and current director of the Ottawa Wild Bird Care Centre as well as sitting on boards for the Ottawa Rural Clean Water Program, and numerous public groups relating to habitat and conservation.