Despite being on leave of absence at Purdue he was promoted to Research Professor in Theoretical Physics there. However, when he had finished his war work he resigned his position at Purdue to take up a post at Harvard.
Sa kabila ng pagiging sa iwan ng pagliban sa Purdue siya ay itaas sa Research Professor sa panteorya Physics doon. Gayunman, kapag natapos na niya ang kanyang war trabaho niya-ayon sa kanyang posisyon at Purdue na tumagal ng isang post sa Harvard.