 STV's oldest predecessor firm, Seelye Stevenson Value & Knecht, was founded in New York City in 1912 as Elwyn E. Seelye & Co. as a structural engineering firm.The firm performed multi-discipline engineering services throughout the country, working on projects such as the Thomas Jefferson Memorial in Washington, D.C., the parachute jump at the 1939 World's Fair, NASA's Vehicle Assembly Building at the Kennedy Space Center in Florida, and the Enrico Fermi National Accelerator Laboratory in Batavia, Illinois.Sanders & Thomas, another predecessor firm of STV's, was founded in Pennsylvania in 1945.