MIT Radar School: Visiting Assistant Professor of Communications 1943-1946; Department of Electrical Engineering: Assistant Professor 1947-1954; Associate Professor 1954-1961; Professor 1961-1977; Professor Emeritus 1977-; Research Laboratory of Electronics, Research Staff member 1951-1954; Lincoln Laboratory, Research Staff 1952-1954; MIT Electronic Systems Laboratory, Director 1953-1974; MIT VI-A Cooperative (Internship) Program in Electrical Engineering, Director 1960-1969.