Bill Xia is president of Dynamic Internet Technology Inc., which helps Chinese web users get around the firewalls the authorities have erected to control access to information on the web. Since he left China in the 1990s, he has devoted his time to researching Internet censorship in China and developing information technology that can penetrate such efforts in totalitarian regimes. Xia is also involved with http://www.freenet-china.org and is the founder of DynaWeb.