Phillip L. Hammack, Ph.D., is Professor of Psychology and Director of the Sexual and Gender Diversity Laboratory at the University of California, Santa Cruz. Dr. Hammack is an expert on gender and sexual identity diversity and diversity in intimate relationships. His research has been supported by the National Institutes of Health and the William T. Grant Foundation and has appeared in numerous scientific journals. He has received several early career awards for his research and has been a fellow at the Center for Advanced Study in the Behavioral Sciences at Stanford University. 

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University of California, Santa Cruz

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Photos by Melissa De Witte. Original art © Joe Weidman.