Jennifer Hirsch's research spans five intertwined domains: the anthropology of love; gender, sexuality and migration; sexual, reproductive and HIV risk practices; social scientific research on sexual assault and undergraduate well-being, and the intersections between anthropology and public health.She has published articles in journals such as American Journal of Public Health, Studies in Family Planning, AIDS, and Culture Health and Sexuality. Her books include A Courtship After Marriage: Sexuality and Love in Mexican Transnational Families (University of California Press, 2003), which explores changing ideas and practices of love, sexuality and marriage among Mexicans in the U.S. and in Mexico, and the coauthored The Secret: Love, Marriage and HIV (Vanderbilt University Press, 2009), which analyzes the social organization of extramarital sexual practices in Mexico, Nigeria, Uganda, Vietnam, and Papua-New Guinea and the implications of those practices for married women's HIV risk. Along with Dr. Claude Ann Mellins, Hirsch co-directed the Sexual Health Initiative to Foster Transformation (SHIFT), a study supported by Columbia University that examines sexual health and sexual assault among Columbia and Barnard undergraduates. She is the co-author, with sociologist Shamus Khan, of the Sexual Citizens: A Landmark Study of Sex, Power, and Assault on Campus, which was named an NPR best book of 2020. Hirsch has been involved in many state-level legislative advocacy campaigns. She is currently working with the Caring Majority on Fair Pay for Home Care workers, and with a statewide coalition to pass legislation ensuring access to comprehensive sexuality education.