He worked there from 1934 to 1936 and it was during this period that he proposed "Zorn's Lemma" for which he is best known.
Siya ay nagtrabaho doon mula sa 1,934 sa 1936 at ito ay panahon na ito na siya iminungkahing "Zorn's Lemma" na kung saan ay siya ang pinakamahusay na kilala.