Our Staff / Mike Marcolongo

Mike Associate Director Headshot Photo

Mike Marcolongo

Associate Director

Mike’s love for nature was instilled while roaming the woods on the family farm that borders the Hall’s Pond wetland complex, formerly in Puslinch Township, Wellington County. His first campaign was at the age of 14, when he was the sole delegate at a Guelph City Council meeting pushing for a hunting ban within the city limits. Early in his career, Mike worked for several environmental organizations including the Ontario Environment Network and Evergreen. He then joined the Province of Ontario, where he worked for three separate Ministries over almost 20 years. Mike never left environmental advocacy, having started organizations such as Protect Our Moraine in Guelph and the Greenbelt West Coalition in the Grand River Watershed. After he left the Ontario Public Service, following the Premier Ford government’s announcement that it was going to carve up the Greenbelt, Mike started a grassroots campaign called “Keep the Greenbelt Promise” with the Guelph-based Water Watchers. Mike loves to read, travel, cycle, ski and swing a hammer.

Read Mike's Posts

Sep 09, 2026

A 400-Series Hwy Through a Conservation Reserve? Another Reason Ontarians Reject Hwy 413

If you’ve ever hiked through the Nashville Conservation Reserve just north of Kleinburg, you know…

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Aug 28, 2026

Statement: Response to Approval of New Brunswick Gas and Diesel Plant

Statement from Environmental Defence Associate Director Mike Marcologo in response to approval of New Brunswick…

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May 29, 2026

Media Advisory: Environmental Defence launches FAO Request for Highway 413

Statement by Mike Marcolongo, Associate Director, Environmental Defence Toronto | Traditional territories of the Mississaugas…

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Dec 09, 2025

Highway 413 “Milestone” Announcement Hides Lack of Progress Towards Construction

Statement By Mike Marcolongo, Associate Director, Environmental Defence Toronto | Traditional territories of the Mississaugas…

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Aug 26, 2025

Gas Plants Take Priority in Ontario’s Energy Plans

Ontario is buying energy and lots of it in the next four years. The Long…

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Mar 13, 2025

Five Reasons Renewable Energy Developers are Losing Confidence in Ontario

In 2024, renewable energy developers had all the right reasons to be optimistic about the…

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Feb 25, 2025

US Tariff Threat: We Need to Focus on Made-in-Ontario Energy

If Ontario is serious about positioning the province as an energy powerhouse in the face…

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Jan 29, 2025

Highway 413 – The Destructive, Expensive and Unnecessary Highway

This blog is part of our series outlining what we see as some of the…

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