His first student was Paul Halmos who completed his doctorate with the thesis Invariants of certain stochastic transformation: The mathematical theory of gambling systems in 1938.
Kanyang unang mag-aaral ay Paul Halmos na natapos na ang kanyang titulo ng doktor na may tisis Invariants ng ilang stochastic pagbabagong-anyo: Ang matematika ng mga teorya gambling system sa 1938.