Saarinen received his first critical recognition in 1940 for "Tulip Chair" he and Charles Eames designed together. Saarinen also took first prize in the 1948 competition for the design of the Jefferson National Expansion Memorial in St. Louis, which was not completed until the 1960s. The first major work by Saarinen, in collaboration with his father, was the General Motors Technical Center in Warren, Michigan, constructed in 1956. Other most famous Saarinen are: the TWA Flight Center at John F. Kennedy International Airport in New York, and the main terminal of Dulles International Airport near Washington, D.C.