When Goodwin came back to the United States from Paris, he gained employment with the New York office of Delano & Aldrich, where he worked from 1914 to 1916. He then formed a partnership with
Roger Bullard and Heathcote M. Woolsey, and started a new firm, Goodwin, Bullard & Woolsey. By 1921, he became an independent architect. Goodwin retired in 1953. In 1939, Goodwin designed the
Museum of Modern Art (MoMA) along with fellow architect,
Edward Durell Stone, which was later expanded by Philip Johnson. He was on the Board of Trustees of the museum, Chairman of the Architecture Department (1935-), and used the traditional
Beaux-Arts architecture style. He spent two months in Brazil with
G. E. Kidder Smith in preparation for the project. He was vice-chairman of the Board at MoMA, as well as the Chairman and chief supporter of the Department of Architecture; Chairman of the Exhibitions Committee; and a member of the Committee on the Museum Collections. His design of the
Noble Judah Estate was added to the
National Register of Historic Places on August 3, 1990. The estate was built from 1925 to 1928 for lawyer Noble Brandon Judah, his wife and National Cash Register heiress Dorothy Patterson, and their children. It includes a main house, a garden, a pool, and several small outbuildings. His
French Renaissance Revival designs include steep roofs, decorative brickwork, and half-timbering. The estate's landscape design was inspired by traditional French gardens and includes a small Korean boxwood garden with a geometric layout. He was a member of the
American Institute of Architects (AIA), and became a
Fellow in 1935. He was also a member of the
Architectural League of New York and Trustee of the
Beaux-Arts Institute of Design. == World War I ==