Who Was Tom O'Brien? The Jockey Behind Dream Alliance's Welsh National

Who was Tom O'Brien?

Tom O'Brien was an Irish-born jump jockey who rode more than 1,000 winners in Britain and Ireland, won five Grade 1 races and took the Welsh Grand National twice, most famously on Dream Alliance in 2009. He died aged 39 after a long battle with cancer, Sky Sports and the Racing Post reported on November 11, 2026.

For most fans, the Tom O'Brien jockey story comes down to two horses. Thyme Hill gave him his biggest days late in his career. Dream Alliance, a horse born on a Welsh allotment and owned by villagers, gave him a win that ended up on cinema screens.

The British Horseracing Authority's chief executive, Brant Dunshea, led the tributes. He said Tom was "held in the highest esteem" and remembered him as a brilliant jockey, a valued colleague, a loyal friend and a devoted father.

Tom O'Brien, jockey: the career at a glance

O'Brien was born in Wexford and began in Ireland. The Racing Post says he worked as a teenager at Ballydoyle for his uncle, Aidan O'Brien, before moving to Britain in 2004 to join trainer Philip Hobbs in Somerset.

His breakthrough came in the 2006-07 season. He rode 105 winners, his best total, and was crowned champion conditional jockey. That same spring he finished second in the 2007 Grand National on McKelvey.

The big wins

A few numbers worth knowing:

• 1,000 winners: he reached the milestone in August 2021. The Racing Post's career total is 1,077.
• One Irish win: almost all of those winners came in Britain. His only Irish winner was I Hear A Symphony at Punchestown in 2008.
• Five Grade 1s: Grade 1 is the top level of jump racing. Our guide to what a Grade 1 race is explains the system.

Thyme Hill and the last ride

The Thyme Hill partnership with Philip Hobbs gave O'Brien his best late-career days. The pair won the 2021 Liverpool Hurdle at Aintree and then the 2022 Kauto Star Novices' Chase at Kempton. That second race is for novice chasers, horses that had not won a chase before the current season began, so it helps to know how a novice chase works.

O'Brien retired at Sandown's end-of-season meeting in April 2023. Fittingly, his last ride was Thyme Hill, who finished fourth on April 29.

Dream Alliance: the true story behind Dream Horse

This is the part of the story that will last. Dream Alliance was not bred on a big stud farm. He was born on a disused allotment, a rented garden plot, next to the rugby club in Blackwood in south Wales.

He belonged to a syndicate of 23 people from the village of Cefn Fforest. Local reports from 2009 say each member paid £10 a week toward his upkeep.

Injury, comeback and a 20-1 win

• 2008: Dream Alliance severed a tendon in a handicap hurdle at Aintree's Grand National meeting in April. He was pulled up, and it looked like the end of his career.
• The rescue: the villagers raised about £20,000 to save him, and he earned the nickname "Sicknote."
• December 2009: he came back to win the Welsh Grand National at Chepstow at 20-1, with O'Brien riding for trainer Philip Hobbs. He beat Silver By Nature by three-quarters of a length.

That underdog run became the film Dream Horse. If you search "Dream Horse true story," this is it: a working-class village, an allotment-bred horse, a bad injury and a jockey who brought him home in Wales' biggest jump race.

Why small-owner stories matter

Dream Alliance showed fans that racing is not only for the very rich. Shared ownership still exists today, and our explainer on how racehorse partnerships work covers the basics, costs and risks.

What is the Welsh Grand National?

The Welsh Grand National is a long-distance handicap chase at Chepstow racecourse in Wales. It is traditionally run in the days just after Christmas.

• Distance: about 3 miles 6½ furlongs (roughly 6.2 km). Chepstow lengthened it in 2019 for a safer run to the first bend.
• Fences: 23 since that change.
• Handicap: better horses carry more weight, so the field is evened out.
• Ground: often heavy in Welsh winter, which makes stamina everything.

Winning it twice, with horses from two different stables, is a big part of O'Brien's legacy.

What is a conditional jockey?

A conditional jockey is a young professional jump jockey who is still learning the job, attached to a trainer's yard. It is the jump-racing version of an apprentice on the flat (see our guide to apprentice jockeys).

To give them a fair chance against senior riders, conditionals "claim" a weight allowance. Their horse carries a few pounds less until the rider wins enough races. The claim only applies in races whose conditions allow it; the BHA notes it is meant for riding against full professionals, and some races don't permit it.

O'Brien's 105 winners in 2006-07 made him champion conditional. That title often marks the next generation of top jump jockeys.

How racing is remembering him

Tributes came from across British racing on November 11. Trainers, racecourses, fellow riders and broadcasters described a hard-working, gentle and humble man.

• The BHA's Brant Dunshea praised him as a jockey, colleague and friend.
• Johnson White, now co-trainer with Philip Hobbs, spoke about him on the Nick Luck Daily Podcast as a hard-working family man.
• The Racing Post reports that jockey Ciaran Gethings dedicated a win on Javert Allen the previous Saturday to him.

The family has not shared details beyond the public tributes, and their privacy deserves respect. O'Brien would have turned 40 on November 28.

What to watch next

• Tributes at the races: watch for moments of remembrance at British jump meetings in the coming days. The Paddy Power Gold Cup meeting at Cheltenham is the next big jump fixture.
• The 2026 Welsh Grand National: it is expected at Chepstow in the days after Christmas. Check the official racecard for the confirmed date.
• Watch Dream Horse: it is a feel-good way to explain jump racing to newcomers and older kids. Children and Media Australia rates it unsuitable for under-8s and recommends parental guidance for ages 8 to 11, because of coarse language, sexual references and a distressing scene after a race accident.
• Learn the basics: our glossary covers terms like chase, hurdle and handicap, and disciplines explains where jump racing fits.

If you ride, O'Brien's career is also a reminder of how hard and risky jump racing is. Our guide to jockey safety gear shows how riders are protected today.