David O'Brien

David O'Brien is a former Irish racehorse trainer. He was the son of highly successful trainer Vincent O'Brien.

His primary successes included Assert who won the 1982 Irish and French Derbies and Secreto who won the 1984 Derby, defeating El Gran Senor trained by his father Vincent,. David O'Brien remains the youngest trainer to win the Derby, Irish Derby or French Derby.

He retired from training in the late 1980s and moved to France where he purchased a vineyard, Chateau Vignelaure, where he immersed himself in the production and distribution of what is now considered to be a world class wine. In 2009, David and his family decided to move to Australia, where his wife Catherine and mother Jacqueline had both grown up. They now reside in Perth, with their 2 youngest children.