Croker operated a stable of thoroughbred racehorses in the United States in partnership with Mike Dwyer.
In January 1895, they sent a stable of horses to England under the care of trainer Hardy Campbell, Jr. and jockey Willie Simms.
Following a dispute, the partnership was dissolved in May but Croker continued to race in England.

In 1907, his horse Orby won Britain's most prestigious race, The Derby.
Orby was ridden by American jockey John Reiff whose brother Lester had won the race in 1901.
Croker was also the breeder of Orby's son Grand Parade who won the Derby in 1919.
Croker operated a stable of thoroughbred racehorses in the United States in partnership with Mike Dwyer. In January 1895, they sent a stable of horses to England under the care of trainer Hardy Campbell, Jr. and jockey Willie Simms. Following a dispute, the partnership was dissolved in May but Croker continued to race in England.
In 1907, his horse Orby won Britain's most prestigious race, The Derby. Orby was ridden by American jockey John Reiff whose brother Lester had won the race in 1901. Croker was also the breeder of Orby's son Grand Parade who won the Derby in 1919.
Richard Croker