Tom Preston-Werner
Tom Preston-Werner
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Tom Preston-Werner

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Tom Preston-Werner

Thomas Preston-Werner (born May 27, 1979) is an American billionaire software developer and entrepreneur. He is an active contributor within the free and open-source software community, most prominently in the San Francisco Bay Area, where he lives.

He is best known as a co-founder and former CEO of GitHub, a Git repository web-based hosting service, which he co-founded in 2008 with Chris Wanstrath and P. J. Hyett. He resigned from GitHub in 2014 when an internal investigation concluded that he and his wife harassed an employee. Preston-Werner is also the creator of the avatar service Gravatar, the TOML configuration file format, the static site generator software Jekyll, and the Semantic Versioning Specification (SemVer). As of 2023, he and his wife have committed to The Giving Pledge—a promise to give away or donate a majority of their wealth to philanthropic causes.

Preston-Werner grew up in Dubuque, Iowa. His father died when he was a child. His mother was a teacher and his stepfather was an engineer.

He graduated from high school at Dubuque Senior High School and attended Harvey Mudd College in Claremont, California for 2 years before dropping out to pursue other endeavours.

As an active contributor to the open-source developer and hacker culture, most prominently in areas involving the programming language Ruby, he has written articles regarding his philosophies and opinions on various issues. He has been featured as a guest on podcasts, including Rubyology and SitePoint.

Preston was one of the initial members of the San Francisco group IcanhazRuby or ICHR[when?], after he became a regular member of the San Francisco Ruby Meetups. He continued until the meetings became overwhelmed by venture capital investors searching for talent; this prompted him to seek more private gatherings.

Preston-Werner is the creator of the TOML configuration file format.

In an article published by Hacker Monthly in 2010, Preston wrote about his passion for ensuring that developers document the code they write so others can easily understand how it works.

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