Tom Preston-Werner
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Tom Preston-Werner is a cofounder and chief technology officer of GitHub, a web site that makes it easy for users to collaborate on software projects and share code. This site has attracted a community of more than one million developers and strives to lower the barriers of collaboration by building powerful features into its products, making it easier for users to contribute and write better code, faster.

Preston-Werner also invented the Gravatar, a globally recognized image that follows its user around the internet to help identify posting on blogs, web forums, or other internet activities. He sold Gravatar in 2007.

He lives and works in San Francisco. The weather there is strange, but he loves it, and the mountain biking is unbelievably good.