Sam joined NASA Langley Research Center as co-op student in 1964. His duties have included work with Supersonic Aerodynamics, Advanced Concepts Systems Analysis, Vehicle Design, Technology Studies and Methods Development, performing modeling of aircraft operations, airport capacity, aircraft fleets, demand of aviation services, and projection of future aircraft operation by route and frequency. He retired from government service in 2001 as lead for Inter-center Systems Analysis and Head of the Systems Analysis Branch Since 2001. He’s been a contractor for ASAB with Swales, ATK, and currently AMA.