It is nearly impossible to overstate the importance of Walter Gropius (1883-1969) to the development of modern architecture. He founded the Bauhaus with Ludwig Mies Van der Rohe where he trained the first great generation of European modernists, then taught at Harvard's Graduate School of Design where he trained the first generation of great American modernists. As a theorist and thinker he laid out the underpinnings of the modernist movement, and as an architect constructed numerous works that stand as exemplars of those ideas. His most important buildings include the Bauhaus School and Faculty in Dessau, Germany; the Gropius House in Lincoln, Massachusetts; the Pan Am Building in New York; the Embassy of the United States in Athens, Greece; and Wayland High School in Wayland, Massachusetts. He founded the Architect's Collaborative in 1945, which would come to be a leading architecture firm, and his furniture designs include the D 51 armchair and the F 51 armchair and sofa.