- 1995 - April 1995 - date
- 1993 - April 1993 - March 1995
- 1989 - May 1989 - March 1993
- 1985 - February 1985 - April 1989
- 1975 - April 1975 - July 1981
- Professor, Gifu University, Gifu, Japan
- Associate Professor, Nagaoka university of Technology, Niigata, Japan
- Associate Professor and Chairman, Division of Geotechnical and Transportation Eng., Asian Institute of Technology, Bangkok, Thailand
- Senior Research Engineer, Takenaka Tech. Res. Institute, Tokyo, Japan
- Research Engineer, Takenaka Technical Research Institute, Tokyo, Japan