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. Source: Wikipedia (en)