Who was the leading athlete for horseback riding in the 1920s?

The leading athlete for horseback riding in the 1920s was undoubtedly Colonel Joseph F. McLain, known for his exceptional skills in show jumping and eventing. He represented the United States in various international competitions and was a prominent figure in the equestrian community. His contributions helped elevate the sport's profile during that decade. Additionally, he was instrumental in promoting equestrian activities and competitions in the U.S.