Prior to that, David was with the National Voluntary Laboratory Accreditation Program (NVLAP) for 14 years. He initially served as the Program Manager for NVLAP's largest program, where he was responsible for the accreditation of over 600 asbestos testing laboratories. In 1994 he was named the Deputy Chief of NVLAP responsible for managing the day-to-day operations while also serving as the Program Manager for NVLAP's Fasteners and Metals Program. In October of 1999, he was named the Chief of NVLAP.