He has held academic posts previously at James Madison University and Goldsmith College University of London. He has published articles on the historical relations between human societies and nature, the green industrial revolution, the “production of nature” debate, the libertarian traditions of the political left, and the public understanding of science. He is the author of Murray Bookchin: A Critical Appraisal (2008) and, with Chris Wilbert, The Colin Ward Reader (forthcoming, 2009).