High Quality Content by WIKIPEDIA articles! Shelden DeMar Williams (born October 21, 1983 in Oklahoma City, Oklahoma) is an American professional basketball player who plays for the Boston Celtics. His jersey number, 23, was retired by Duke University on January 28, 2007. His size (6'9", 250 lbs), aggressive style of play, and shot-blocking ability earned him the nickname "The Landlord." During high school, Williams was a member of the National Honor Society and the Fellowship of Christian Athletes.