Donald Croll is a Professor in Ecology and Evolutionary Biology, University of California, Santa Cruz (UCSC), Co-founder of the conservation non-profit Island Conservation, Founding partner and Science Director of the conservation for-profit Conservation Metrics, Inc., Faculty Director of the UCSC Natural Reserve System, a John Muir Fellow and a National Geographic Fellow. He has conducted conservation research on island ecosystems and marine vertebrates for over 30 years, and trained over 600 undergraduates in marine conservation, conservation biology, and field methods in conservation. Together with his long-time collaborator, Bernie Tershy, he has trained 17 graduates and post docs that have gone on to significant positions in conservation and resource management. Don received his B.S. in biology from the University of California, Davis, M.S. in marine sciences from Moss Landing Marine Laboratories, and a Ph.D. in marine biology from Scripps Institution of Oceanography.