The Biographical and Professional Series (0.5 linear feet, 1942-1990), although limited in quantity, is the portion of the collection that offers the widest overview of Muschenheim's life and work. Researchers will find fairly detailed material useful for becoming familiar with accomplishments at various stages of his career. Particularly valuable are the files regarding nomination for Fellowship, American Institute of Architects. Nomination materials include comprehensive biographical statistics (to 1961); descriptions of achievements in design work, exhibitions and jury participation; detailed data regarding publications; and achievements related to initiatives in education. Also important is a file with material about Peter Behrens and his school in Vienna, Austria, where Muschenheim was immersed in modern theory from 1925 to 1929. Additionally, the series includes a folder with various "lists of work," created at different times for different purposes and a transcription of an interview conducted by the Oral History Research Office of Columbia University in 1987 (a copy of the finding aid, "The William Muschenheim Architectural Drawings and Papers, 1902-1990," Avery Library, Columbia University, is also included in the series). A folder containing obituaries is an excellent source for studying how Muschenheim's career was assessed at the time of his death in 1990.