one of amen's clinics provides brain scans for current and former national football league players. amen made the initial diagnosis of brain damage in nfl kicker tom dempsey. during medical examinations and scans, amen found three holes in dempsey's brain, along with other damage. he has also provided diagnosis and therapy for hockey player paul kariya, related to his concussion issues; amen advised kariya to retire as a professional, which he did.