Although Ito remained as a professor at Kyoto University until he retired in 1979, he also held positions as professor at Aarhus University from 1966 to 1969 and professor at Cornell University from 1969 to 1975.
Kahit Ito ay nanatili bilang isang propesor sa Kyoto University hanggang siya ay nagretiro sa 1979, siya din ang hawak na posisyon bilang propesor sa University Aarhus 1966-1969 at propesor sa Cornell University 1969-1975.