of the New England architectural tradition that I found still alive and adequate." Helen Storrow, a banker's wife and philanthropist, became Gropius's benefactor when she invested a portion of her land and wealth for the architect's home. She was so satisfied with the result that she gave more land and financial support to four other professors, two of whom Gropius designed homes for. With the Bauhaus philosophy in mind, every aspect of the homes and their surrounding landscapes was planned for maximum efficiency and simplicity. Gropius's house received a huge response and was declared a National Landmark in 2000. Gropius and his Bauhaus protégé Marcel Breuer both moved to Cambridge, Massachusetts, to teach at the Harvard Graduate School of Design (1937–1952) and collaborate on projects including The Alan I W Frank House in Pittsburgh and the company-town Aluminum City Terrace project in New Kensington, Pennsylvania, before their professional split. In 1938 he was appointed Chair of the Department of Architecture, a post he held until his retirement in 1952. Gropius also sat on the Massachusetts Institute of Technology (MIT) Visiting Committee at the end of his career. The well-known architect designed the Richards and Child residence halls on the Harvard campus that were built in the 1950s. In 1944, he became a naturalized citizen of the United States. Gropius was one of several refugee German architects who provided information to confirm the typical construction of German houses to the RE8 research department set up by the British Air Ministry. This was used to improve the effectiveness of air raids on German cities by the Bomber Command of the Royal Air Force in World War II. The research was to discover the most efficient way of setting fire to houses with incendiary bombs during bombing raids. The findings were used in planning raids such as the bombing of Hamburg in July 1943. The Architects Collaborative In 1945, Gropius was asked by the young founding members of The Architects Collaborative (TAC) to join as their senior partner. TAC represented a manifestation of his lifelong belief in the significance of teamwork, which he had already successfully introduced at the Bauhaus. Based in Cambridge, the original TAC partners included Norman C. Fletcher, Jean B. Fletcher, John C. Harkness, Sarah P. Harkness, Robert S. MacMillan, Louis A. MacMillen, and Benjamin C. Thompson. Among TAC's earliest works were two residential housing developments in Lexington, Massachusetts: Six