The Society of Toxicology (SOT) recently has learned of the passing of SOT Charter Member John H. Weisburger on February 17, 2014. Dr. Weisburger was the recipient of the 1981 SOT Merit Award, which is presented to a member of the Society in recognition of distinguished contributions to toxicology throughout an entire career in areas such as research, teaching, regulatory activities, consulting and service to the Society. He was a member of the Carcinogenesis, Comparative and Veterinary, and Food Safety Specialty Sections as well as of the Mid-Atlantic Regional Chapter. Dr. Weisburger received his doctorate at the University of Cincinnati in Ohio in 1949. He served in a number of capacities at the National Cancer Institute and was a research professor at the New York Medical College in Valhalla, New York.