W3C-Provider community is an international organisation where Member organizations, a full-time staff, and the public work together to develop Technology standards. Led by Web inventor Tim Berners-Lee and CEO Jeffrey Jaffe, W3C's mission is to lead the Web to its full potential.
W3C does not have a single physical headquarters. There are three institutions, however, that "host" W3C: MIT (in Cambridge, MA, USA), ERCIM (in Sophia-Antipolis, France), and Keio University (near Tokyo, Japan).
The W3C staff is distributed around the world, but there are concentrations of people in Cambridge, Massachusetts (USA), Sophia-Antipolis (France), and Tokyo (Japan). In addition, W3C is represented in 17 other regions of the world via representatives based at organizations. W3C calls these regional points of contact "W3C Offices."
From the W3C site
The W3C was founded in October 1994 to lead the World Wide Web to its full potential by developing common protocols that promote its evolution and ensure its interoperability. We are an international industry consortium, jointly hosted by the Massachusetts Institute of Technology Laboratory for Computer Science [MIT/LCS] in the United States; the Institut National de Recherche en Informatique et en Automatique [INRIA] in Europe; and the Keio University Shonan Fujisawa Campus in Japan. Services provided by the Consortium include: a repository of information about the World Wide Web for developers and users; reference code implementations to embody and promote standards; and various prototype and sample applications to demonstrate use of new technology. Initially, the W3C was established in collaboration with CERN, where the Web originated, with support from DARPA and the European Commission. For details on the joint initiative and the contributions of CERN, INRIA, and MIT, please see the statement on the joint World Wide Web Initiative.