William John Cunningham is an American former professional basketball player and coach, who was nicknamed the Kangaroo Kid for his leaping and record-setting rebounding abilities. He spent a total of 17 seasons with the NBA's Philadelphia 76ers, and two seasons as a player with the Carolina Cougars of the ABA.

The Carolina Cougars were a basketball franchise in the American Basketball Association that existed from 1969 through 1974. The Cougars were originally a charter member of the ABA as the Houston Mavericks in 1967. The Mavericks moved to North Carolina in late 1969 after two unsuccessful seasons in Houston at the Sam Houston Coliseum.