Taha Caner Leblebici

Gropius accepted the appointment as chairman of Harvard's Graduate School of Design and again Breuer followed his mentor to join the faculty in Cambridge, Massachusetts. The two men formed a partnership that was to greatly influence the establishment of an American way of designing modern houses – spread by their great collection of wartime students including Paul Rudolph, Eliot Noyes, I. M. Pei, Ulrich Franzen, John Johansen, and Philip Johnson. One of the most intact examples of Breuer's furniture and interior design work during this period is the Frank House in Pittsburgh, designed with Gropius as a Gesamtkunstwerk.

Breuer broke with his father-figure, Walter Gropius, in 1941 over a very minor issue but the major reason may have been to get himself out from under the better-known name that dominated their practice. Breuer had married their secretary, Constance Crocker Leighton, and after a few more years in Cambridge, moved down to New York City (with Harry Seidler as his chief draftsman) to establish a practice that was centered there for the rest of his life.

The Geller House I of 1945 is one of the first to employ Breuer's concept of the 'binuclear' house, with separate wings for the bedrooms and for the living / dining / kitchen area, separated by an entry hall, and with the distinctive 'butterfly' roof (two opposing roof surfaces sloping towards the middle, centrally drained) that became part of the popular modernist style vocabulary. Breuer built two houses for himself in New Canaan, Connecticut: one from 1947 to 1948, and the other from 1951 to 1952. A demonstration house set up in the MoMA garden in 1949 caused a flurry of interest in the architect's work, and an appreciation written by Peter Blake. When the show was over, the "House in the Garden" was dismantled and barged up the Hudson River for reassembly on the Rockefeller property in Pocantico Hills near Sleepy Hollow.