- Editorial board for several Japanese journal papers and special issues
- Committee members for several Japanese academic societies
- Conference Chair and Program Committee member
- Workshop Co-Chairs, 3rd International Workshop on Supporting Knowledge Collaboration in Software Development (KCSD2009), Tokyo, Japan, November, 2009.
- Workshop Co-Chairs, 2nd International Workshop on Supporting Knowledge Collaboration in Software Development (KCSD2006), Tokyo, Japan, September, 2006.
- Committee Member, IBM CASCON 2009 Workshop on Software Engineering 2.0 & Research 2.0, Markham, Ontario, Canada, November 2009.
- Program Committee, 2009 International Workshop on Empirical Software Engineering in Practice (IWESEP 2009), Osaka, Japan, October, 2009
- Program Committee, 10th International Workshop on Principles of Software Evolution (IWPSE-EVOL2009), Amsterdam, Netherlands, August, 2009.
- Program Committee, 9th International Workshop on Principles of Software Evolution (IWPSE2007), Dubrovnik, Croatia, September, 2007.
- Program Committee, 5th Working Conference on Mining Software Repositories (MSR2008), Leipzig, Germany, May, 2008.
- Program Committee, 4th International Workshop on Mining Software Repositories (MSR2007), Minneapolis, MN, May, 2007.
- and, many for domestic (Japanese) conferences.
Masao Ohira 