For the past several years, I have been pursuing the goal of understanding climate change on time-scales from decades to millions of years. I am particularly interested in what forces natural climate variability, how past climates have influenced the ecology and diversity of organisms in the tropics, as well as how climate change and other human activities will affect the eventual fate of these organisms.

School Division

Earth & Climate Sciences


  • Ph.D., University of California, San Diego (1981)
  • M.S., Pennsylvania State University (1975)
  • B.A., University of Rochester (1973)

Recent Publications