The Society of Toxicology (SOT) has learned of the passing of SOT Member Charlotte Mertz Witmer on October 15, 2013. A celebration of her life will be held on Saturday, May 10, 2014 at 1:00 pm at the Trinity Reformed United Church of Christ, Collegeville, Pennsylvania. Dr. Witmer was a biochemist and toxicologist with degrees from Ursinus College and Villanova University. She taught and conducted research at Rutgers University, Jefferson Medical College, University of Pennsylvania Medical School, and the Institute of Toxikologie in Tübingen, Germany. She joined SOT in 1979 and was a member of the Mid-Atlantic Regional Chapter and the Comparative and Veterinary, Mechanisms, and Metals Specialty Sections.