Credentials: participation in safety groups.

• David has long been a member of the National Fire Protection Association (NFPA), publishers of the National Electrical Code. He participates, as a member of the public, in contributing proposed changes to be considered for adoption, as well as supplying comments on others' proposed changes and on proposed temporary interim amendments, emergency measures.
• In 2022, NFPA appointed him as a Special Expert on maintenance to serve on the Code-Making Panel for NFPA 73, the Standard for Electrical Inspection for Existing Dwellings.
• He serves on four committees updating UL standards. These specify how electrical equipment should be designed and marked, and the tests it has to pass to earn UL or other laboratory listing. (He was solicited to join a fifth Standard Committee, and also to join UL's Electrical Council, but demurred.)
• In 2017, when Prince George's County, Maryland still employed a master electrician to serve as Chief Electrical Inspector, he was drafted for the committee to rewrite Subtitle 9 (electrical) of the County Code. Unfortunately, the county stopped using a chief electrical inspector, and has hesitated to bring its electrical code up to date.
• He functioned as recording secretary for the American Council on Electrical Safety for 15 years. ACES served as a meeting place where members of testing laboratories discussed issues of common concern with representatives of regulatory agencies and subject-matter experts.
• From the mid-1990s to 2023 he served as Secretary-Treasurer of the International Association of Electrical Inspectors (IAEI)'s DC/Maryland chapter and as a member of the executive board for IAEI's Eastern section.