Brewster is the Chair of the Ohio River Way Board. He has spent 40+ years as an environmental activist and political organizer in Greater Cincinnati. An avid kayaker, he is the founder of the Ohio River Paddlefest, the largest paddling event in the U.S. and on the board of Adventure Crew, the sponsoring nonprofit that works in 25 innercity high schools to get urban teens out into nature to paddle, hike, bike, fish, ski and camp. Brewster was the executive director of Green Umbrella, Greater Cincinnati’s sustainability alliance and worked on the staff of Ohio Governor Ted Strickland as his SW Ohio Regional Director. He is on the board of the Mill Creek Alliance and the Ohio Environmental Council Action Fund.