Barrie R. Cassileth is an American researcher of complementary and alternative medicine, and has published extensively on alternative cancer treatments. She founded the Integrative Medicine Service at the Memorial Sloan-Kettering Cancer Center, and holds the Laurance S. Rockefeller Chair in Integrative Medicine. She also founded the Society for Integrative Oncology, which publishes a medical journal. Cassileth, born Barrie Rabinowitz, obtained her PhD in medical sociology from the University of Pennsylvania in 1978.