His doctoral work was supervised by Veblen, and he was awarded his doctorate in 1927 for his dissertation entitled Alternatives to Zermelo's Assumption.
Ng doktor Kanyang trabaho ay supervised by Veblen, at siya ay iginawad sa kanyang titulo ng doktor sa 1927 para sa kanyang disertasyon may karapatan alternatibo sa Zermelo ng palagay.