Greg Stein (born March 16, 1967 in Portland, Oregon), living in Austin, Texas, United States, is a programmer, speaker, sometime standards architect, and open-source software advocate, appearing frequently at conferences and in interviews on the topic of open-source software development and use. He was a director of the Apache Software Foundation, and served as chairman from 21 August 2002 to 20 June 2007. He is also a member of the Python Software Foundation, was a director there from 2001 to 2002, and a maintainer of the Python programming language and libraries (active from 1999 to 2002). Stein has been especially active in version control systems development. In the late 1990s and early 2000s, he helped develop the WebDAV HTTP versioning specification, and is the main author of mod_dav, the first open-source implementation of WebDAV. He was one of the founding developers of the Subversion project, and is primarily responsible for Subversion's WebDav networking layer. Stein most rec