Receiving a Rockefeller Fellowship to work with Karl Pearson in London, he arrived there in September 1925 but was disappointed to discover that Pearson was ignorant of modern mathematics.
Tumatanggap ng isang Rockefeller Fellowship sa trabaho sa Karl Pearson sa London, siya dumating doon sa Setyembre 1925 ngunit ay bigo upang matuklasan na Pearson ay walang pinag-aralan ng mga makabagong matematika.