- 2012/04/01 - University of Tsukuba
- 2011/10/01 - University of Tsukuba Faculty of Engineering, Information and Systems
- 2004/04/01 - 2011/09/30 University of Tsukuba
- 2009/04/01 - 2011/03/31 University of Tsukuba
- 2006/04/26 - 2009/03/31 University of Tsukuba Master's Program in Business Administration and Public Policy, Graduate School of System and Information Engineering Chair
- 2005/04 - 2006/03 France Telecom Japan Co., Ltd. Scientific Advisor
- 2002/04 - 2004/03 University of Tsukuba Vice President
- 2000/04 - 2002/03 University of Tsukuba Institute of Policy and Planning Sciences Chair
- 1993/10 - 2002/03 University of Tsukuba Professor
- 1997/04 - 1999/03 University of Tsukuba Doctral Program in Policy and Planning Sciences Chair
- 1993/04 - 1993/09 IBM Japan, Ltd. Tokyo Research Laboratory
- 1992/04 - 1993/03 IBM Japan, Ltd. Tokyo Research Laboratory
- 1990/10 - 1992/03 IBM Japan, Ltd. Tokyo Research Laboratory
- 1987/03 - 1990/09 IBM Japan, Ltd. Tokyo Research Laboratory
- 1985/08 - 1987/02 IBM Japan, Ltd. Tokyo Research Laboratory
- 1984/07 - 1985/07 IBM Japan, Ltd.
- 1983/07 - 1984/06 IBM Japan Science Institute
- 1974/04 - 1979/06 IBM Japan, Ltd.
- University of Tsukuba Faculty of Engineering, Information and Systems Provost
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Institute of Electrical and Electronics Engineers (IEEE)
, Institute for Operations Research and the Management Sciences
, THE OPERATIONS RESEARCH SOCIETY OF JAPAN
, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS.