Department of Electrical Engineering; Research Assistant 1932-1939; Instructor 1939-1941; Assistant Professor 1941-1944; Associate Professor in Electrical Communications 1944-1951; Professor 1951-1966; MIT Radar School teaching staff 1941-1945 and Associate Director 1944-1945; Lincoln Laboratory: Division Head 1954-1957; Associate Director 1957-1964; Director 1964-1966.
