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Tom Preston-Werner

b. 1979

American businessman

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About Tom Preston-Werner

Born 1979. Tom Preston-Werner is an American software developer, computer scientist, businessperson, software engineer, business executive and programmer, known for GitHub.

Thomas Preston-Werner (born May 27, 1979) He resigned from GitHub in 2014 when an internal investigation concluded that he and his wife harassed an employee. the static site generator software Jekyll, and the Semantic Versioning Specification (SemVer). , 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.

Early life 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. 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-Werner was one of the initial members of the San Francisco group IcanhazRuby or ICHR, 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.

Career 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.

In 2004, Preston-Werner founded Gravatar, a service for providing globally unique avatars that follow users from site to site. Preston-Werner sold the company to Automattic in 2007. In 2005 he moved to San Francisco to work at Powerset, a natural language search engine. Powerset was acquired by Microsoft. Preston-Werner declined a $300,000 bonus and stock options from Microsoft so that he could focus on GitHub.

In 2010, Preston-Werner read a comment on Twitter insulting the quality of GitHub's search function. This prompted him to overhaul the service's search, drawing on his experience having worked at Powerset. GitHub initially denied Horvath's allegations, then following an internal investigation, confirmed some of the claims. Preston-Werner resigned. GitHub's new CEO Chris Wanstrath said the "investigation found Tom Preston-Werner in his capacity as GitHub's CEO acted inappropriately, including confrontational conduct, disregard of workplace complaints, insensitivity to the impact of his spouse's presence in the workplace, and failure to enforce an agreement that his spouse should not work in the office."

After GitHub Following his resignation from GitHub, Preston-Werner sold his shares in the company to Microsoft. Along with a team of former GitHub co-founders and executives, Preston-Werner then cofounded Chatterbug, a software for language-learning. In 2018, Chatterbug cofounder Scott Chacon announced an $8 million (~$ in ) series A funding round for the company, financed by himself and Preston-Werner. Preston-Werner, a hacker himself, has hosted AMA-style events for student hackers, such as for Hack Club, at the Def Hacks Virtual 2020 hackathon, and Dubhacks 2020.

Personal life

Preston-Werner lives in San Francisco with his wife Theresa and their sons.

His wife is a former graduate student in cultural anthropology known for her involvement in historical research and social subjects.

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Important facts

Birth century
Occupation
Software developer, computer scientist, businessperson, software engineer, business executive, programmer
Nationality
Known for
GitHub
Education
Dubuque Senior High School, Harvey Mudd College
Employers
Gravatar, Powerset
Also known as
Thomas Preston-Werner, mojombo

People in Tom Preston-Werner's life

Named in this biography and alive at the same time

Contemporaries

People whose lives overlapped Tom Preston-Werner's

Frequently asked questions

Who is Tom Preston-Werner?

American businessman

When was Tom Preston-Werner born?

Tom Preston-Werner was born on 28 October 1979 in Dubuque.

What is Tom Preston-Werner's occupation?

Tom Preston-Werner is a software developer, computer scientist, businessperson, software engineer, business executive and programmer.

What is Tom Preston-Werner known for?

Tom Preston-Werner is known for GitHub.

What nationality is Tom Preston-Werner?

Tom Preston-Werner is American.

Sources & further reading

· Wikipedia: Tom Preston-Werner

· Wikidata: Q16602077

· DBpedia: Tom Preston-Werner

Cite this page

APA: Biography.guide. (2026). Tom Preston-Werner. https://biography.guide/tom-preston-werner/

MLA: "Tom Preston-Werner." Biography.guide, https://biography.guide/tom-preston-werner/.

Chicago: "Tom Preston-Werner." Biography.guide. https://biography.guide/tom-preston-werner/.

Data last updated: 2026-09-23 · Spot an error? Report a correction.

Portrait: Wikimedia Commons · author & licence

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