Founder & developer several internet businesses including Inforseek Japan, Rakuten, Inc., Digital Garage, Eccosys & PSINet Japan. Angel investor Joichi Ito, since 1966. Associate to Mr. Mount (The Executive Producer) Indian Runner, 1989—1991.
Producer XY Relax, 1990—1991. Chief Executive Officer Mac Zone Japan, 1993—1994, Eccosys, Ltd., 1994—1997, Digital Garage, Inc., 1995—1999, PSINet Japan Inc., 1995—1996. Chairman Infoseek Japan, 1996—2003.
Headmaster Bithaus, 1997—1998. Founder, board directors, Chief Executive Officer Neoteny Company, Tokyo, since 1999. Chief Executive Officer Kula Limited company, since 2001.
Treasurer, co-founder Computer Scientists for Social Responsibility, Japan, 2002—2006. Chairman Six Apart Japan, since 2004. General manager, global operations Technorati, 2004—2006, board directors, 2006—2010.
Chairman Creative Commons, 2006—2008, Chief Executive Officer, since 2008. Senior visiting researcher Keio University Students Fighting Cancer Research Institute, since 2008. Advisor Twitter, since 2009.
General partner Neoteny Labs, since 2009. Board directors Energy Conversion Devices, Inc., 1995—2000, Pia Corporation, 2002—2008, Socialtext, 2004—2010, Nihon Gigei Inc., since 2004, Open Source Initiative, 2005—2007, Computer Scientists for Social Responsibility, 2005—2008, BUG, 2006—2008, WITNESS, since 2006, Digital Garage, since 2006, CGM Marketing, since 2006, Rupture, 2007—2008, Sanrio Digital, United States, since 2007, Outblaze, since 2007, Global Voices, since 2007, Tucows, since 2008, Emitac, since 2008, Machinima.com, since 2008, fotonauts, since 2008. Part time instructor Keio Graduate School of Media Design, since 2008.
Board advisory PicScout, since 2009. Board directors Startl, since 2009, Commodity Credit Corporation Limited company, since 2009, Public Knowledge, since 2009, thesixtyone, since 2009, FreStyl, since 2009.