paul allan offit (born 27 march 1951) is an american pediatrician specializing in infectious diseases, vaccines, immunology, and virology. he is the co-inventor of a rotavirus vaccine. offit is the maurice r. hilleman professor of vaccinology, professor of pediatrics at the perelman school of medicine at the university of pennsylvania, former chief of the division of infectious diseases (1992-2014), and the director of the vaccine education center at the children's hospital of philadelphia. he has been a member of the centers for disease control (cdc) advisory committee on immunization practices. offit is a board member of every child by two and a founding board member of the autism science foundation (asf).