Hammack, Phillip L.

Phillip L. Hammack is an American academic in the field of psychology. As of 2025, Hammack is a professor at University of California, Santa Cruz, where he works with the Psychology Department, Stevenson College, and John R. Lewis College. He is also director of the university's Sexual and Gender Diversity Laboratory. His research explores "gender and sexual identity diversity and diversity in intimate relationships". After completing his bachelor’s at Georgetown University in 1998, Hammack earned a Master of Arts in clinical psychology from Loyola University Chicago and a Doctor of Philosophy in cultural psychology from the University of Chicago. Hammack served as president of the Society for Qualitative Inquiry in Psychology and as co-editor of the journal Psychology & Sexuality. He has received fellowships from the American Psychological Association and Center for Advanced Study in the Behavioral Sciences (2017–18). He has received the following awards and honors: Louise Kidder Early Career Award, American Psychological Association (2011) Erik Erikson Early Career Award, International Society of Political Psychology (2013) William T. Grant Foundation Scholar Award (2013–14)