Dr. Samuel L Brock retired January 2019 as the Subject Matter Expert for Toxicology for the Environmental Management Directorate, Technical Support Division of the United States Air Force Civil Engineer Center, San Antonio, Texas. As the Subject Matter Expert, his responsibilities included resolving problems or issues impacting toxicology and risk assessment concerning the conditions and vulnerabilities of systems extending across the Air Force and DoD. Responsibilities also included developing and advocating for required technical courses in conjunction with the Air Force Institute of Technology (AFIT) and/or other schools. He served as an invited Instructor at the Air Force Institute of Technology, Wright Patterson AFB, OH, from 2003 through 2015 and he was an internet-based training Instructor on the ITRC Project Risk Management for Site Remediation technical guidance from 2011 through 2014 as well as Remediation Management of Complex Sites technical guidance from 2018 and continues as an “Emeritus” trainer. He represented the Air Force on working groups developing National and DoD guidance on remediation risk management, explosive risk assessment, vapor intrusion, and bioavailability of contaminants in soil and sediments. Sam has been a member of the ITRC Remediation Risk Management Team, the ITRC Green and Sustainable Remediation Team; the Remediation Management of Complex Sites Team and currently, the Implementing Advanced Site Characterization Tools Team. Sam regularly presented at professional meetings and technical forums on remediation topics. His recent work included supporting DoD Materials of Emerging Regulatory Interest working groups and Military Family Housing Privatization Initiative activities addressing persistent legacy pesticides in soil. Sam developed and deployed an initiative software-enabled process to implement principles and practices for Remediation Management of Complex Sites across the Air Force Enterprise portfolio of difficult, high cost sites. Sam received a Doctorate in Veterinary Medicine from Purdue University in West Lafayette, Indiana in 1970 and a Master of Public Health, Epidemiology from University of North Carolina in Chapel Hill in 1976. He is a Licensed Veterinarian in Texas and is certified by the American College of Veterinary Preventive Medicine.