From the W3C site itself: “The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards. Led by Web inventor Tim Berners-Lee and CEO Jeffrey Jaffe, W3C's mission is to lead the Web to its full potential. Contact W3C for more information.”
They are in charge of many Web Standards, including the following:
If you want to join and be part of this important community, you can actually do so ! Check out their membership page.