At Northwestern he was one of the most liked professors in the Mathematics Department and was recognised by all for the excellence, skill, and understandability of his lectures and especially his proofs.
At mula sa hilagang-kanluran siya ay isa sa mga pinaka-nagustuhan professors sa ang Mathematics Department at noon ay kinikilala sa pamamagitan ng lahat para sa kagalingan, kasanayan, at understandability ng kanyang mga lektura at lalo na sa kanyang proofs.