John Reynolds is a Canadian ecologist and holder of the Tom Buell BC Leadership Chair in Salmon Conservation and Management at Simon Fraser University.

As an undergraduate at the University of Toronto, he was inspired by Jim Rising and Richard Knapton to study evolutionary ecology.

Current research lines of his lab include: conservation ecology of wild salmon and their ecosystem, impacts of nutrients from seaweed on plants and birds on oceanic islands, biology of extinction risk in marine fishes and impacts of climate change on fishes.

Currently, he is Co-Chair of marine fish committee of the COSEWIC (Committee on the Status of Endangered Wildlife in Canada),[2] member of NSERC (Natural Sciences and Engineering Research Council of Canada) - Evolution and Ecology Evaluation Panel, and fellow of Pacific Wildlife Foundation.

[5] His most cited journal article is "Climate change and distribution shifts in marine fishes" published in Science in 2005,[6] which has been referred to 1,133 times according to Google Scholar.