Then he moved to the United States, where he received master's degree in applied mathematics at the University of Kansas City (now known as the University of Missouri-Kansas City) in 1951 and a Ph.D. in mathematics from Caltech under the supervision of Robert P. Dilworth in 1955.
Derefter flyttede han til USA, hvor han tog en mastergrad i anvendt matematik ved University of Kansas City (i dag kendt som University of Missouri-Kansas City) i 1951 og ph.d. i matematik fra Caltech under tilsyn af Robert P. Dilworth i 1955.