There was a unicycle leaning near his front door and a hammock chair hanging from a tree, out over the Milwaukee River, when we stopped by. He takes his laptop out to the swinging seat to work sometimes, he told us. A few signs of the unique and adventurous mind that is Ken Leinbach. Ken makes an adventure of mitigating his impact on the planet, by inviting flight attendants to serve his drinks into reusable containers that he brings aboard planes, by not owning a car and by commuting by bike, rollerblades, kayak—and, yes, unicycle. It is impossible to imagine Milwaukee today without the Urban Ecology Center, now in three locations, popular and welcoming spaces for environmental learning. Ken grew those community centers from one trailer in a high-crime  park to what they are today, though he is quick to point out it was a grassroots effort. He is also a nationally recognized educator and a participant in the Academy for Systems Change, a big-thinking group that accelerates awareness-based systemic change on a broad range of social, economic and ecological fronts.