Kira Ganga Kieffer is a scholar of American religions, history, culture, and politics with a PhD in Religious Studies from Boston University. She is Visiting Assistant Professor of Religious Studies at Fairfield University.

Kieffer's first book, Unvaccinated Under God: Religion and Vaccine Hesitancy in Modern America (Princeton University Press, May 19, 2026) examines the spiritual and religious roots of vaccine resistance in U.S. history. In general, her work examines contestations over authority through the interactions between religion, alternative health movements, politics, and consumption.