Research Professor, University of Michigan

My research addresses energy and transportation with a focus on environmental challenges especially oil use, CO2 emissions and climate mitigation options. I also address energy and climate policy more broadly and direct the University of Michigan Energy Survey. My teaching and advising work has addressed transportation energy policy and sustainable energy systems as well as student research in other energy and environmental topics.

Prior to joining the University of Michigan faculty in 2009, I was senior fellow for automotive strategies at the Environmental Defense Fund (EDF; 2001-2009), transportation director at the American Council for an Energy Efficient Economy (ACEEE; 1990-2000) and a staff scientist at the National Audubon Society (1988-1990).


  • 2011–present
    Research Professor, University of Michigan Energy Institute
  • 2009–2014
    Lecturer and Clinical Professor, University of Michigan School of Natural Resources and Environment
  • 2001–2009
    Senior Fellow, Environmental Defense Fund
  • 1990–2000
    Program Director, American Council for an Energy-Efficient Economy
  • 1988–1990
    Staff Scientist, National Audubon Society


  • 1988 
    Princeton University, Ph.D., Mechanical Engineering
  • 1983 
    North Carolina State University, M.S., Mechanical Engineering
  • 1974 
    Catholic University of America, B.A., Mathematics


  • 2015
    For up-to-date list, see
  • 2015
    For discussions, see