- 2000/04 - 現在 Tokyo University of Technology School of Computer Science Professor
- 1985 - 2000 日本電信電話株式会社研究所 研究員
- 1985 - 2000 NTT Laboratories, Research Engineer
- 1993 - 1997 The University of Electro-Communications
- 1993 - 1997 University of Electro-Communications, Part-time lecturer
- 1975 - 1985 日本電信電話公社電気通信研究所 研究員
- 1975 - 1985 Electrical Communication Laboratories, NTT, Research Engineer
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