The Naismith Memorial Basketball Hall of Fame, located in Springfield, Massachusetts, honors players who have shown exceptional skill at basketball, all-time great coaches, referees, and other major contributors to the sport. It is named after James Naismith, who conceived the sport in 1891; he was inducted into the Hall as a contributor in 1959. To be considered for induction, nominees must meet certain prerequisites. Players must have been retired for at least three years before becoming eligible. Referees must have either been retired for at least three years, or, if they are still active, have officiated for at least 25 years at high-school-level programs or higher. Coaches must have either been retired for at least three years, or, if they are still active, have coached for at least 2