Jonathon Calvin Simmons is an American professional basketball player who last played for Al Riyadi of the Lebanese Basketball League. He played one season of college basketball for the Houston Cougars before a stint in the semi-professional American Basketball League (ABL) led to him joining the NBA D-League's Austin Toros in 2013. Following two seasons in the D-League, Simmons signed with the San Antonio Spurs after an impressive 2015 NBA Summer League.