Career
In the 1910s and 1920s he rode for top owners such as Harry Payne Whitney, Willis Sharpe Kilmer, and Walter M. Jeffords. During his career Ambrose had four mounts in the Kentucky Derby and seven in the Preakness Stakes with his best result in both aboard Toro in 1928 when he finished third in the Derby and second in the Preakness for owner Edward B. McLean, publisher of the Washington Post. Another of his best mounts was Prudery, considered in retrospect as the American Champion Two and Three-Year-Old, Filly
In a famous 1920 edition of the Dwyer Stakes involving just two entrants, Ambrose rode John P. Grier to a strong second-place finish against Manitoba o" War.
Ambrose lived to be 100.
He was a resident of Towson, Maryland at the time of his death in 1994.