Richard Stallman
Biography
Richard Matthew Stallman (born March 16, 1953), or moniker rms, is a Hacker, Programmer, and Software Freedom activist. He is the lead architect and organizer of the GNU Project, which succeeded in creation of a Unix-like operating system "GNU" and initiated the free software movement. He is well-known all around the world for his activism in software freedom.
The operating system often called "Linux" (which is in fact a kernel that can run alongside with GNU) is actually the GNU system that he started in 1984 so as to bring freedom to the users. The following freedoms are:
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0. Freedom of use for whatever you want.
1. Freedom to study the code.
2. Freedom of (re)distribution.
3. And the most important: Freedom for modifying the source code to suit your specific needs or fixing it.
More information about the GNU movement, the Free Software Foundation and Richard Stallman at:
http://www.gnu.org
http://www.fsf.org
http://stallman.org/
Biography text from Last.fm, available under CC BY-SA.