In the fall of 1948, Singleton returned to MIT to pursue a doctorate in electrical engineering. He obtained Jerome Wiesner as his mentor. (Wiesner was later the President of MIT and also Science Advisor to three U.S. Presidents.) At the Rad Lab during WWII, Wiesner had developed an important optimum linear filter and prediction technique. For his dissertation, Singleton generalized Wiesner's technique for the nonlinear situation, making a major contribution to the emerging field of information theory. He was awarded the Sc.D. degree in 1950.Singleton, Henry Earl; “Theory of Nonlinear Transducers,” Dissertation, Massachusetts Institute of Technology, 1950
