Aidan O'Brien

Aidan O'Brien
Aidan O'Brien before the start of the 2012 Epsom Derby.
Occupation	Trainer
Born	(1969-10-16) 16 October 1969 (age 47) County Wexford, Ireland
Significant horses
Istabraq, Giant's Causeway, Mozart, Imagine, Galileo, Johannesburg, Hawk Wing, Rock of Gibraltar, High Chaparral, Powerscourt, Oratorio, Yeats, Scorpion, George Washington, Alexandrova, Dylan Thomas, Peeping Fawn, Duke of Marmalade, Henrythenavigator, Mastercraftsman, Fame and Glory, Rip Van Winkle, Lillie Langtry, St Nicholas Abbey, Cape Blanco, Misty for Me, Roderic O'Connor, So You Think, Treasure Beach, Camelot, Ruler of the World, Australia, Gleneagles, Qualify, Minding

Aidan Patrick O'Brien (born 16 October 1969 in County Wexford, Ireland) is an Irish horse racing trainer. Since 1996, he has been the private trainer at Ballydoyle Stables near Cashel in County Tipperary for John Magnier and his Coolmore Stud associates.

Aidan O'Brien was one of six children of Denis O'Brien (d. 1 December 2008) and his wife Stella (née Doyle). Denis was a farmer and small-scale horse trainer in the townland of Killegney, near Poulpeasty, in County Wexford, where Aidan grew up.

Aidan O'Brien attended Donard National School, located less than a mile from his parents' home. He subsequently attended secondary school at Good Counsel College, New Ross, also located in County Wexford. O'Brien is a member of the Pioneer Total Abstinence Association, meaning that he does not drink alcohol.

O'Brien first started working professionally with horses at P.J. Finn's racing stables at the Curragh, County Kildare, and then with Jim Bolger at Coolcullen, County Carlow.

Aidan O'Brien is married to Anne-Marie (née Crowley). Anne-Marie's father, Joe Crowley trained horses at Piltown, County Kilkenny, where his tenure was interrupted in quick succession by his daughter Anne-Marie (Champion National Hunt Trainer during her brief time at the helm), his son-in-law Aidan O'Brien (who took over from his wife in 1993 but moved on to Ballydoyle in 1996) and then another daughter, Frances Crowley (who moved on to train on the Curragh for some years). Joe then renewed his own training licence for some years before retiring.