Richard Stallman (born 1953) is the founder of the gnu-and-free-software-1983-1997 era's central institution and its defining philosophical voice. His full intellectual biography — the MIT AI Lab, the Emacs editor, the GNU Project, his political philosophy — is covered in depth in the Stallman KB. This entry focuses on his role within the broader FOSS movement.
Stallman launched the gnu-and-free-software-1983-1997 era with the gnu-manifesto-1983 (1983) and founded the free-software-foundation in 1985. His most durable contribution to the movement was not any particular piece of software but a legal innovation: the copyleft principle, embodied in the gpl-v2 and later gpl-v3. Copyleft transformed the four freedoms from a philosophical position into an enforceable legal mechanism.
The four-freedoms — to run, study, modify, and redistribute software — remain the defining statement of the free software position and serve as a point of contrast for every debate about software-freedom-vs-open-source.
The open-source-schism-and-dotcom-1998-2004 exposed a rift between Stallman's ethical-philosophical framing and the pragmatic "open source" rebranding led by eric-raymond and bruce-perens. Stallman consistently refused the "open source" label, arguing it evacuated the political content of the movement. This tension was never resolved and defines the movement's internal politics to this day.
Stallman resigned from the free-software-foundation and MIT in September 2019 following controversy over public statements about the Jeffrey Epstein case. He returned to the FSF board in March 2021, a move that generated significant protest from within the FOSS community. His status within the movement remains contested.