Tom Preston-Werner
American businessman · United States · On the map · Executives · Born 1979 · age 47
He created GitHub, the platform that reshaped how millions of developers share and collaborate on code - then stepped down in 2014 after an internal investigation into workplace harassment.
Tom Preston-Werner is read about 151 times a day, in 8 languages.
A typical day, 30 days to 11 November 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 400 days, one point a day.
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About this person
Tom Preston-Werner built the infrastructure under much of modern software: Gravatar for profile images, Jekyll for static sites, TOML for configuration, and Semantic Versioning for release management. In 2008 he co-founded GitHub with Chris Wanstrath and P. J. Hyett, turning Git repository hosting into a social network for developers. The company became the hub of open-source culture worldwide. Six years later an internal probe found that he and his wife had harassed an employee, and he resigned as CEO. By 2023 he and his wife had signed The Giving Pledge, committing most of their wealth - by then in the billions - to philanthropy.
