Aiden O’Brien

GRAND PRAIRIE, TX - OCTOBER 27: Trainer Aiden O'Brien of Ireland fields questions from the news media after morning workouts in preparation for the Breeders' Cup World Thoroughbred Championships October 27, 2004 at Lone Star Park in Grand Prairie, Texas. (Photo by Matthew Stockman/Getty Images)

Irish-born Aiden O’Brien is currently ranked as the top flat-racing trainer, with a total of 67 wins, 47 second positions and 43 third positions out of 349 runs. In 2007, O’Brien earned a whopping total of €5,104,480 in winning and place money.

O’Brien is the private trainer for John Magnier and his associates at Coolmore Stud, and heads the Ballydoyle Stables in County Tipperary.

Horses trained by Aiden O’Brian have won the 2000 Guineas a total of four times. In 1998, King of Kings – ridden by jockey Michael Kinane and owned by Michal Tabor and Sue Magnier, won the 2000 Guineas. In 2002, Rock of Gibraltar took the race with jockey Johnny Murtagh. Both times with jockey Kieren Fallon, Footstepsinthesand won in 2005 and George Washington won in 2006

Aiden O’Brien’s other British Classic racing wins include:

  • the 1000 Guineas in 2005, with Virginia Waters
  • the Epsom Derby Stakes, twice – with Galileo in 2001 and again on High Chaparral in 2002
  • Epsom Oaks, a total of three times – with Shahtoush in 1998, Imagine in 2001 and Alexandrova in 2006
  • St Leger, three times – with Milan in 2001, Brian Boru in 2003 and Scorpion in 2005


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