2017- Distinguished Visiting Scholar, ASIAA
2009-17 Distinguished Research Fellow, ASIAA
2004-08 Director, Space VLBI Project, NAOJ
2004-06 Chair, Radio Astronomy Division, NAOJ
2002-04 Director of Engineering, NAOJ
1998-02 Director of NRO, NAOJ
1994-08 Professor, NAOJ and Univ. of Tokyo
1988-94 Associate Professor, NAOJ
1981-88 Research Associate, Tokyo Astronomical Observatory
1978-81 Postdoc Fellow, Tokyo Astronomical Observatory
1977-78 Research Fellow, JSPS
PASJ Excellent Paper Award, ASJ, 2005
Laurels for Team Achievement Award, IAA, 2005
Nishina Memorial Prize, 1996
Rubin Prize, 1995
Group Achievement Awards, NASA, 1988
Astronomical Society of Japan
International Astronomy Union (IAU)
International Union of Radio Science (URSI)
Committee on Space Research (COSPAR)
Treasurer, ASJ
Chair and Vice Chair, URSI Commission J (Radio Astronomy)
Chair of Liaison Committee of Radio Science, Science Council of Japan (SCJ)
Chair, Japanese VLBI Consortium
Member (past and present):
Liaison Committee of Astronomy, SCJ
Liaison Committee of Space Science, SCJ
Space Science Steering Committee, ISAS/JAXA
Task Force on Radio Astronomy and Radio Spectrum, OECD Global Science Forum
Global VLBI Working Group, IAU and URSI
VSOP and VSOP-2 International Science Council (VISC and VISC2)
Committee of East Asia VLBI Consortium
Agencies SKA Group Meeting