Don Croll received a B.S. in biology from the University of California, Davis, M.S. in Marine Sciences from Moss Landing Marine Labs, and a Ph.D. in Marine Sciences from Scripps Institution of Oceanography. He is a Professor in Ecology and Evolutionary Biology at the University of California, Santa Cruz. He co-founded Island Conservation, a science-based NGO with 35 employees and an annual budget of 5 million.