Tom Preston-Werner (Developer Tools / Open Source) at GitHub — San Francisco, United States

Tom Preston-Werner co-founded GitHub and created several widely adopted open-source technologies including Semantic Versioning, Gravatar, and Jekyll (static site generator). He stepped down from GitHub in 2014. Preston-Werner is now focused on Chatterbug (language learning), Buildkite investment, and open-source through his Preston-Werner Ventures fund, while remaining an influential voice on developer tools and AI-assisted software development.