- 1956
- graduated from University of Tokyo
- 1957
- entered Department of Otolaryngology, University of Tokyo
- 1962 - 64
- Research fellow, Massachusetts Eye and Ear Infirmary
- 1967
- Assistant Professor, University of Tokyo
- 1971
- Associate Professor
- 1980 - 91
- Professor and Head, University of Tokyo
- 1991 - 7
- Professor and Head, Showa University
- 1992
- Professor Emeritus, University of Tokyo
- 1997 -
- Visiting Professor of Showa University
- 1992 - 6
- Chairman, Board of Directors, The Oto-Rhino-Laryngological Society of Japan
- 2003 -
- Chairman, Board of Directors, The Society for Promotion of International Oto-Rhino-Laryngology