University of Tsukuba
Usui is a Professor Emeritus at University of Tsukuba, and a Professor at the Graduate School of International Business &amp; Cultural Studies, Shukutoku University. Formerly he taught at the Graduate School of Media &amp; Governance at Keio University from 1991 to 1995, as well as at the Graduate School of Management &amp; Public Policy Studies, University of Tsukuba from 1976 to 1991.