His first university appointment came when he was appointed as Instructor in Mathematics at Cornell University for 1942, and his next was to the same position at Purdue University from 1942 to 1945.
Kanyang unang unibersidad appointment dumating kapag siya ay hinirang bilang titser sa Mathematics sa Cornell University para sa 1942, at sa kanyang tabi ay ang parehong posisyon sa Purdue University 1942-1945.