GitHub CEO Thomas Dohmke today announced that he is leaving the company to start his own venture. Microsoft will not be replacing his role; instead, GitHub and its leadership team will become part of Microsoft’s CoreAI organization.
In his announcement blog post, Dohmke mentioned that he will remain with the company through the end of 2025 to help guide the transition. Microsoft will share more details on this process soon.
Thomas Dohmke became part of Microsoft when his company, HockeyApp, was acquired in 2014. After joining Microsoft, he managed the team that built HockeyApp, Visual Studio App Center (the next generation of HockeyApp), Xamarin Test Cloud, CodePush, and Azure Notification Hubs. He later joined the GitHub organization, rising to the position of Chief Product Officer in 2021. When Nat Friedman left Microsoft, Dohmke became CEO of GitHub.
After nearly four years as CEO, I’m leaving GitHub to become a startup founder again.
— Thomas Dohmke (@ashtom) August 11, 2025
With more than 1B repos and forks, 150M+ developers, and Copilot continuing to lead the most thriving market in AI with 20M users and counting, GitHub has never been stronger than it is today.…
Under his leadership, GitHub continued its strong growth momentum. Dohmke also highlighted the following milestones for GitHub today:
- GitHub now hosts more than 1 billion repositories and forks, and over 150 million developers.
- The number of AI projects on GitHub has doubled in the last year alone.
- GitHub Actions is now one of the world’s leading CI solutions, powering 3 billion minutes per month—up 64% year-over-year.
- GitHub Copilot, which launched as an autocompletion tool, has evolved into a conversational coding agent with Copilot Chat & Voice.
- GitHub Copilot leads the AI coding market with over 20 million users.
- GitHub Copilot became the first multi-model solution at Microsoft to offer models from rival firms, including Anthropic and Google.
GitHub’s move into Microsoft’s CoreAI division marks a strategic shift, reinforcing its focus on AI integration and paving the way for its next phase of growth.