| 1966-1967 | Japan National Railway |
| 1967-1975 | Research Assistant, Tokyo Institute of Technology |
| 1975-1987 | Associate Professor, Tokyo Institute of Technology |
| 1987-1996 | Professor, Tokyo Institute of Technology |
| 1996-2004 | Professor, The University of Tokyo |
| 2002- | Professor Emeritus, Tokyo Institute of Technology |
| 2004-2009 | Professor, National Graduate Institute for Policy Studies (GRIPS) |
| 2004- | President, Institute for Transport Policy Studies (ITPS) |
| 2004- | Board member, Research and Education Board, GRIPS Program Director; Development Policy Program, GRIPS Professor Emeritus, The University of Tokyo |
| 2005- | Program Director, Disaster Management Policy Program, GRIPS |
| 2009- | Senior Professor, GRIPS |
| 1980-1981 | Research Fellow; Transportation System Division, Dept. of Civil Eng., Massachusetts Institute of Technology |
| 1986-1987 | Part-time Lecturer; Dept. of Civil Eng., Chuo University |
| 1989-1990 | Head of Department; Dept. of Civil Eng., Graduate school, Tokyo Institute of Technology |
| 1990-1991 | Head of Department; Dept. of Civil Eng., Tokyo Institute of Technology |
| 1991-1992 | Part-time Lecturer; Dept. of Commercial Science, Keio University |
| 1992-1993 | Visiting Professor; University of the PHILIPPINES |
| 1993-1996 | Head of Research Center for Urban Infrastructure, Tokyo Institute of Technology |
| KISS-Rail, Keys to Implement Successfully Sustainable Urban Railway, JARTS, 2005 | |
| (Editor and Co-author, in English) | |
| Future of Country, Nikkei, 2005 (Editor and Co-author, in Japanese) Future of Airports in Tokyo Metropolitan Area, ITPS, 2010 (Editor and Co-author, in English) Benefit of Road Investment –Theory and Practice-, Tokyo-Keizai-Shinpousha, 2008 |
|
| (Co-Editor and Co-author, in English) |
|
| 1975 | Incentive Award of Japan Society of Civil Engineers |
| 1996 | Dissertation Award of Japan Society of Traffic Engineers |
| 2002 | Culture of Transport Award, Minister of Land, Infrastructure, Land and Tourism |
| 2010 | Publication Award; The Japan Society of Transportation Economics |
| Vice Chairman | ; Council on National Development, 2005-2010, Japan |
| Vice Chairman | ; Council on Infrastructure, 2005-2010, Japan |
| Member | ; Council on Transportation Policy, 2005-2010, Japan |
| Chairman on | ; Railway Policy Committee ; Regional Transportation Policy Committee ; Research and Development committee |
| Chairman | ; Council on Transportation Policy in Kanto Region |
| Chairman | ; Council on Urban Planning in Yokohama City |
| President | ; Japan Society of Traffic Engineers, 2000-2002 |
| President | ; Japan Society of Civil Engineers, 2004-2005 |
| President | ; Eastern Asia Society for Transportation Studies (EASTS), 2003-2007 |
