He joined the philosophy department at Redlands in 1979, and has taught courses in England on the animal rights movement, in mainland Europe on the Holocaust, and in 2004 spent a semester teaching at Reitaku University in Japan.
Ito is an honorary professor of University of Tokyo and International Research Center for Japanese Studies, and a professor of Reitaku University, and the Chairman of Japan Seaology Promotion Organization.
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Saint Martin’s also has sister universities in other Asian countries, including five in Japan (including Mukogawa Women's University and Reitaku University), three in China (including Shanghai Maritime University), and one in Taiwan (Chung Shan Medical University).
He taught at the Wharton School of the University of Pennsylvania from 1991 to 1994, and is now a professor at Reitaku University and guest professor at the Graduate School of Management, Kyoto University.