[2] He teaches two Benjamin Franklin Scholars (BFS) honors courses and graduate level seminars.
He is also a faculty member in the Master of Applied Positive Psychology program started by Martin Seligman.
In 1963, he joined the psychology department at the University of Pennsylvania, where in 1997 he was named the Edmund J. and Louise W. Kahn Professor.
He also served as co-director of the school's Solomon Asch Center for the Study of Ethnopolitical Conflict (which has now moved to Bryn Mawr College).
[citation needed] His teaching and research interests include: acquisition of likes and dislikes for foods, nature and development of the magical belief in contagion, cultural evolution of disgust, ambivalence to animal foods, lay conception of risk of infection and toxic effects of foods, interaction of moral and health factors in concerns about risks, relation between people's desires to have desires and their actual desires (including the problem of internalization), acquisition of culture, nature of cuisine and cultural evolution, and psychological responses to recycled water.