The PGA (Professional Golfer's Association) of America, a not-for-profit organization that promotes the game of golf, was founded on April 10, 1916. With more than 28,000 members, the PGA bills itself as the "largest working sports organization in the world". The PGA conducts four premier golf events: the PGA Championship, the Senior PGA Championship, the Ryder Cup, and the PGA Grand Slam of Golf.