Steere is a real estate agent ("Steere Properties") who is known as a game inventor throughout the world. His first game, Quadrature, won the American Mensa Award in 1993. Steere's most recent award was Parents' Choice for Cephalopod in 2006. He invented 52 games, most of them abstract board games. Numerous games (probably more than of any other game author) were programmed for online play on various internet game servers (e.g. Super Duper Games (SDG), Richard's PBeM Server) and as downloadable, standalone programs. Mark Steere is the main sponsor of Super Duper Games.