Cass Gilbert (November 24, 1859 – May 17, 1934) was a prominent American architect. An early proponent of skyscrapers in works like the Woolworth Building, Gilbert was also responsible for numerous museums (Saint Louis Art Museum) and libraries (Saint Louis Public Library), state capitol buildings (the Minnesota, Arkansas and West Virginia State Capitols, for example) as well as public architectural icons like the United States Supreme Court building. His public buildings in the Beaux Arts style reflect the optimistic American sense that the nation was heir to Greek democracy, Roman law and Renaissance humanism. Gilbert's achievements were recognized in his lifetime; he served as president of the American Institute of Architects in 1908-09.
Gilbert was a conservative who believed architecture should reflect historic traditions and the established social order. His design of the new Supreme Court building (1935), with its classical lines and small size contrasted sharply with the very large modernist Federal buildings going up along the National Mall in Washington, D.C., which he disliked.