Yukihiro Matsumoto
Yukihiro Matsumoto ("Matz"), the creator of Ruby, is a professional programmer who worked for the Japanese open source company, netlab.jp. Matz is also known as one of the open source evangelists in Japan. He's 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 has become known outside of Japan.

The Ruby Programming Language The Ruby Programming Language
by David Flanagan , Yukihiro Matsumoto
January 2008
Print: $39.99
Ebook: $31.99

Ruby in a Nutshell Ruby in a Nutshell
by Yukihiro Matsumoto
November 2001
Print: $24.95
Ebook: $19.99