Peter serves as Regional Director for The Wilderness Society's Northern Rockies office. Previously, Peter worked at the Greater Yellowstone Coalition, first as a Program Associate and later as their Mining Issues Coordinator.

He has also worked in Canmore, Alberta as the Outreach and Media Coordinator for the Yellowstone to Yukon Conservation Initiative, a network of over a hundred Canadian and American conservation groups working to maintain habitat connectivity from the Greater Yellowstone ecosystem to the central Yukon Territory. Peter earned B.A. degrees in Geology and in Environmental Studies from Williams College and an M.S. in Natural Resource Policy from the University of Michigan.