Robert "Bob" Bates (born December 11, 1953) is an American computer games designer. One of the early designers of interactive fiction games, he was co-founder of Challenge, Inc., which created games in the 1980s for the pioneering company Infocom. After Infocom's dissolution in 1989, Bates co-founded Legend Entertainment to continue publishing games in the Infocom tradition, but with added graphics. He has designed, written, or produced scores of games, including Unreal II (2003), Spider-Man 3 (2007), and Eric the Unready (1993), listed as Adventure Game of the Year by Computer Gaming World magazine and also included on the 1996 list of "150 best games of all time". In 1998 he wrote the award-winning game Quandaries for the U.S. Department of Justice. He has twice been the chairperson of the International Game Developers Association, which honored him with a Lifetime Achievement Award in 2010. Bates has written extensively about game design and development in works such as the 2001 book Game Design: The Art and Business of Creating Games, which is commonly used as a game design textbook in college courses. From 2011–2014, Bates was Chief Creative Officer for External Studios at Zynga. He continues to work as an independent consultant with various publishers in the games industry.