Yukihiro Matsumoto
まつもと ゆきひろ
松本 行弘
Yukihiro Matsumoto at the ACM International Collegiate Programming Contest in Tokyo, 14 March 2007
Born (1965-04-14) 14 April 1965 (age 59)
Other namesMatz
Alma materUniversity of Tsukuba (BS)
Shimane University (PhD candidate)
Occupation(s)Computer scientist, programmer, author
Known forRuby
Matsumoto giving the keynote speech at EuRuKo 2011
Matsumoto accepting an award from the Free Software Foundation (founder Richard Stallman, right) in 2012

Yukihiro Matsumoto (まつもとゆきひろ, Matsumoto Yukihiro, born 14 April 1965), also known as Matz, is a Japanese computer scientist and software programmer best known as the chief designer of the Ruby programming language and its original reference implementation, Matz's Ruby Interpreter (MRI). His demeanor has brought about a motto in the Ruby community: "Matz is nice and so we are nice," commonly abbreviated as MINASWAN.

As of 2011, Matsumoto is the Chief Architect of Ruby at Heroku, an online cloud platform-as-a-service in San Francisco. He is a fellow of the Rakuten Institute of Technology, a research and development organization within Rakuten Group, Inc. He was appointed to the role of technical advisor for VASILY, Inc. starting in June 2014.[1]

Early life

Born in Osaka Prefecture, Japan, he was raised in Tottori from the age of four. According to an interview conducted by Japan Inc., he was a self-taught programmer until the end of high school.[2] He graduated with an information science degree from University of Tsukuba where he was a member of Ikuo Nakata's research lab on programming languages and compilers.


He works for the Japanese open source company Netlab.jp. Matsumoto is known as one of the open-source evangelists in Japan. He has released several open source products, including cmail, the Emacs-based mail user agent, written entirely in Emacs Lisp. Ruby is his first piece of software that became known outside Japan.[3]


Matsumoto released the first version of the Ruby programming language on 21 December 1995.[4][5] He still leads the development of the language's reference implementation, MRI (Matz's Ruby Interpreter).


In April 2012, Matsumoto open sourced his work on a new implementation of Ruby called mruby.[6][7] It is a minimal implementation based on his virtual machine, ritevm, and is designed to allow software developers to embed Ruby in other programs while keeping memory footprint small and performance optimized.


In December 2014, Matsumoto open sourced his work on a new scripting language called streem, a concurrent language based on a programming model similar to shell, with influences from Ruby, Erlang, and other functional programming languages.[8]

Treasure Data

Matsumoto has been listed as an investor for Treasure Data; many of the company's programs such as Fluentd use Ruby as their primary language.[9]

Written works


Matsumoto received the 2011 Award for the Advancement of Free Software from the Free Software Foundation (FSF) at the 2012 LibrePlanet conference at the University of Massachusetts Boston in Boston.[10]

Personal life

Matsumoto is married and has four children. He is a member of the Church of Jesus Christ of Latter-day Saints,[11] having performed standard missionary service and become a counselor in the bishopric in his church ward.[12]

See also


  1. ^ "PRESSRELEASE – 株式会社VASILY(ヴァシリー)". vasily.jp.
  2. ^ "The Man Who Gave Us Ruby". japaninc.com.
  3. ^ "Yukihiro Matsumoto". O’Reilly. 1 February 2013.
  4. ^ More archeolinguistics: unearthing proto-Ruby Archived 6 November 2015 at the Wayback Machine
  5. ^ "[ruby-talk:00382] Re: history of ruby". nagaokaut.ac.jp.
  6. ^ "mruby: Lightweight Ruby". 2 November 2017 – via GitHub.
  7. ^ Matt Aimonetti. "mruby and MobiRuby – Matt Aimonetti". aimonetti.net.
  8. ^ "matz/streem". GitHub.
  9. ^ "Company – Treasure Data". Archived from the original on 3 May 2015. Retrieved 1 January 2022.
  10. ^ "2011 Free Software Awards announced". Free Software Foundation. 26 March 2012.
  11. ^ "Hi I'm まつもとゆきひろ (Matsumoto "Matz" Yukihiro)". mormon.org. Retrieved 12 October 2018. I am a computer programmer. I designed a programming language called 'Ruby.' I am a Mormon.
  12. ^ "Colloquium--Yukihiro Matsumoto". BYU. Retrieved 9 November 2017.