Dan Kogai

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Dan Kogai (小飼弾, Kogai Dan, 1969 -) is a Japanese open-source developer and alpha blogger, known for his blog 404 Blog Not Found (ranked #5 in Japan[1]). He is also the former CTO of Livedoor.[2]


Kogai went to middle school, but he had problems with formal education and skipped classes.[3] Immediately after he graduated from middle school at the age of 16 he passed the high-school equivalence exam, and up until age 18 he spent his time teaching senior students as a tutor and cram school teacher.[4] He then entered the University of California, Berkeley.

During his fourth year at university, his family's home burnt down, and he left school.[5] He made a living with the computer skills he had learnt at university, and at age 29 was headhunted by Takafumi Horie to join Livin' On the Edge (now Livedoor).[5]



  • Kogai,Dan (2003). tatsujin ni manabu Perl/CGI dōjō. Impress Communications. ISBN 4844317423.
  • Kogai,Dan (2008). kogai dan no arufagiiku ni atte kita. Gijutsu-Hyohron. ISBN 477413452X.


  • Kogai,Dan (2006). marugoto Perl! Vol.1 -- Web 2.0 wo purogramingu shiyō. Impress Communications. ISBN 4-8443-2289-3.
  • Kogai,Dan (2006). Web 2.0 tsūru no tukaikata -- mada, Google dake desu ka?. Gijutsu-Hyohron. ISBN 4-7741-2908-9.
  • Kogai,Dan (2007). marugoto JavaScript&Ajax! Vol. 1. Impress Communications. ISBN 4-8443-2364-4.
  • Kogai,Dan (2007). 2channeru wa naze tsuburenai no ka?. Fushosha. ISBN 4-5940-5388-2.
  • Kogai,Dan (2008). dangen - seikō suru jinsei to baransu shiito no tsukaikata. Aspect. ISBN 4-7572-1533-9.


  1. ^ "Japan's Top 50 Blogs", Asiajin, August 18, 2008.
  2. ^ Profile of Dan Kogai, O'Reilly Open Source Convention, 2005
  3. ^ Kamihitoe, May 10th, 2008 (in Japanese).
  4. ^ Daigaku ikitakattara gakkō ikanyaka ii no ni Oct. 27, 2006 (in Japanese).
  5. ^ a b Kogai, Dan - Errata, Addeda & FAQ May 17, 2005 (in Japanese).

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