Don 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 of the conservation for-profit Conservation Metrics, Inc., and Faculty Director of the UCSC Natural Reserve System. He has conducted conservation research on island ecosystems and marine vertebrates for over 30 years, and published over 100 papers and articles on the conservation and ecology of marine species and island ecosystems. As a professor, has been dedicated to developing the research programs, courses, and graduate training needed for direct conservation action. As a conservationist, his work has helped inform the closure of California gill net fisheries, the establishment of a ban on commercial fishing for krill US federal waters, the CITES listing of several manta ray species, the establishment of protected islands in Mexico, and the protection of insular threatened species from island invasive species. He has trained over 500 undergraduates in marine ecology and conservation, conservation biology, and field methods in conservation, and together with his conservation partner, Bernie Tershy, he has trained 14 graduates and post docs that have gone on to significant positions in conservation and resource management.