SOT Member Stephen M. DiZio passed away in October 2012. Dr. DiZio was Chief, Human and Ecological Risk Office, California Environmental Protection Agency-Department of Toxic Substances, Sacramento. Dr. DiZio joined SOT in 1994 and he was the Chair of the Animals in Research Committee and a Toxicology Specialist. In addition, Dr. DiZio was an active member of the Northern California Regional Chapter Board and served as the 2010-2011 President of this region. In addition, he was a member of the Comparative and Veterinary, Reproductive and Developmental, and Risk Assessment Specialty Sections.