Richard A. Bartle, Ph.D., co-wrote the first virtual world, MUD ("Multi-User Dungeon"), in 1978, thus being at the forefront of the online gaming industry from its very inception. A former university lecturer in Artificial Intelligence, he is an influential writer on all aspects of virtual world design and development. As an independent consultant, he has worked with almost every major online gaming company in the U.K. and the U.S. over the past 20 years. Richard lives with his wife, Gail, and their two children, Jennifer and Madeleine, in a village just outside Colchester, England. He works in virtual worlds.