He won team silver in show jumping at the 1960 Rome Olympics and is considered a founding father of hunt seat equitation.

[7] Morris trained students at his Hunterdon Stables and traveling clinics, producing nationally and internationally successful riders, including Olympic champions.

[1] He and his siblings rode with the New Canaan Mounted Troop, and by 1947, Morris was riding at the Ox Ridge Hunt Club.

[1][11] With the help of agent Edith Van Cleve, he enrolled in the Neighborhood Playhouse School of Theater and performed in summer stock productions.

[13] He trained with Gunnar Andersen for a year, then started his own farm in 1964, leasing Dave Kelley's Armouk, New York facility.

[11] Throughout the late 1960s, Morris split his time between Connecticut, New York and New Jersey, traveling to train at different facilities and competitions.

[15] In 2005 Morris decided to sell Hunterdon Stables and became chef d'equipe of the United States show jumping team.

[19] On August 5, 2019, Morris was provisionally banned by the United States Center for SafeSport from USEF for sexual misconduct involving a minor.

"[5][13] Some former students and professional riders, in interviews with The New York Times, said they were aware of Morris' relationships with minors throughout his career and particularly in the 1970s.

[13] Others, including Eric Lamaze, Robert Dover, and former student Katie Monahan-Prudent defended Morris through an "I Stand With George" Facebook page and hashtag.

[16] On August 5, 2020, two lawsuits were filed against Morris in New York's Manhattan Supreme Court; both suits allege the rape of minors, and seek financial damages.

[25][26] The lawsuits also target USEF, which the plaintiffs claim turned a blind eye to sexual abuse, which was an "open secret" in the equestrian community.

Live broadcasts of training sessions led by Morris are featured on the United States Equestrian Federation (USEF) network.

[35] He coined the term "drama riding" for the lack of classical position seen in riders in the show ring today.