In 1967 Iwasawa left MIT when he was offered the Henry Burchard Fine Chair of Mathematics at Princeton and it was not long after he arrived there that he took on Greenberg as a research student.
Sa 1967 Iwasawa kaliwa MIT kapag siya ay inalok ng Henry Burchard Fine Chair ng Matematika sa Princeton at ito ay hindi na matapos siya may dumating na siya kinuha sa Greenberg bilang isang pananaliksik estudyante.