Geoghegan claimed the Lightweight Championship of America in 1861, and held it until his retirement in 1863.
That same year, he defeated Deaf Moran, Bill Dukes, Arthur Gowan, and held a draw with Mike Donohue.
[2] Patrick "Scotty" Brannagan retired as Lightweight Champion of America in 1861, and a contest was held between Geoghegan and Eddie Touhey to fill the vacant title.
[3] Between 1861 and 1863 he defended his title against Bob Slaon, Chick Sullivan, Banty Edwards, and Pat Devlin before being challenged by the 144-pound Con Orem.
After 19 rounds and 23 minutes, Geoghegan was declared the winner, when his opponent committed an illegal foul.