Stephen PacalaFrederick D. Petrie Professor in Ecology and Evolutionary Biology.
Pacala is the Frederick D. Petrie Professor in Ecology and Evolutionary Biology. His research focuses on systems ecology, climate change and the global carbon cycle, including the effect of the terrestrial biosphere on climate. Pacala was director of PEI from 2006-2015 and currently directs the Carbon Mitigation Initiative, a major University initiative that addresses the carbon and climate problem. Pacala is founding director of Climate Central, an NGO focused on climate change communications. He is a member of the board of directors for the Environmental Defense Fund.