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tom.preston-werner.comTom Preston-Werner is an American software developer and entrepreneur renowned for co-founding GitHub, a leading platform for software development and version control. His contributions to the tech industry have significantly influenced open-source development and collaborative coding practices.

  • Full Name: Thomas Preston-Werner
  • Date of Birth: May 27, 1979
  • Place of Birth: Dubuque, Iowa, U.S.
  • Nationality: American
  • Education: Attended Harvey Mudd College (did not graduate)
  • Notable Works: Co-founder of GitHub, Creator of Gravatar, Jekyll, TOML, Semantic Versioning
  • Spouse: Theresa Preston-Werner
  • Children: 3
  • Net Worth: Approximately $1.25 billion

Personal Life and Relationships

Tom Preston-Werner resides in San Francisco with his wife, Theresa, and their three children. Theresa, a former graduate student in cultural anthropology, is recognized for her work in historical research and social subjects.

Notable Works and Achievements

In 2008, Preston-Werner co-founded GitHub alongside Chris Wanstrath and P. J. Hyett. Under his leadership as CEO from 2012 to 2014, GitHub became a cornerstone for developers worldwide, revolutionizing collaborative coding.

Charitable Work and Legacy

In 2023, Tom and Theresa Preston-Werner committed to The Giving Pledge, promising to donate a majority of their wealth to philanthropic causes. This commitment underscores their dedication to leveraging success for societal benefit.

Relocating to San Francisco in 2005, he joined Powerset, a company specializing in natural language search technology. Despite a lucrative offer from Microsoft following their acquisition of Powerset, Preston-Werner chose to focus on his own projects, demonstrating his entrepreneurial spirit.

Early Life and Family Background

Born on May 27, 1979, in Dubuque, Iowa, Tom Preston-Werner faced the loss of his father during his childhood. His mother, a teacher, and his stepfather, an engineer, played pivotal roles in his upbringing. This environment fostered a strong appreciation for education and technology, shaping his future endeavors.

Net Worth and Lifestyle

As of 2020, Preston-Werner’s net worth was estimated at $1.25 billion, primarily from the $7.5 billion acquisition of GitHub by Microsoft in 2018

. His wealth reflects his significant contributions to the tech industry.

Career Beginnings and Key Milestones

In 2004, Preston-Werner developed Gravatar, a service providing globally recognized avatars, which he later sold to Automattic in 2007. This venture marked his initial foray into impactful software development.

After graduating from Dubuque Senior High School, Preston-Werner enrolled at Harvey Mudd College in Claremont, California. However, he departed after two years to pursue programming, a field that captivated his interest more than his formal studies.

Beyond GitHub, he created Jekyll, a static site generator, and TOML (Tom’s Obvious, Minimal Language), a configuration file format. He also authored the Semantic Versioning Specification (SemVer), standardizing versioning in software development.

Future Plans and Impact on Culture

Preston-Werner continues to influence the tech industry through various ventures and contributions to open-source projects. His work fosters innovation and collaboration, leaving a lasting impact on software development and digital culture.

Disclaimer: Tom Preston-Werner wealth data updated April 2026.