He was a James Martin 21st Century Professor at Oxford University's Environmental Change Institute in 2006-2007, and a Research Fellow at the Institute for the Theory and Practice of International Relations 2007-2009 at the College of William and Mary, where he also directed the Program in Environmental Science and Policy from 2001 to 2006. His 1992 Sociology Ph.D. was from Johns Hopkins University in the Program in Comparative International Development. His B.A. was in Biology (with research in tropical and temperate ecology) from Kenyon College. He directed Brown University's Center for Environmental Studies from 2009 to 2012.