Legendary Trainer John Shirreffs Dies at 80

Shirreffs guided Giacomo and Zenyatta to historic victories in his nearly 50-year career.

Published on Feb. 20, 2026

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John Shirreffs, an innovative and acclaimed horse trainer who guided Giacomo and Zenyatta to major victories, has died at the age of 80. Shirreffs was known for his patient, unorthodox training methods that brought out the best in his horses, including Giacomo's shocking Kentucky Derby win in 2005 and Zenyatta's 19-race unbeaten streak. Shirreffs worked closely with owners Jerry and Ann Moss and developed a deep bond with the horses in his care.

Why it matters

Shirreffs was a transformative figure in horse racing, known for his innovative training techniques and ability to develop horses into champions. His success with Giacomo and Zenyatta cemented his legacy as one of the sport's all-time great trainers, and his passing marks the end of an era for the sport.

The details

Shirreffs began training horses in 1976 and found his greatest success in the 2000s with Giacomo and Zenyatta. Giacomo was a 50-1 long shot when he won the 2005 Kentucky Derby, a historic upset that Shirreffs predicted thanks to the horse's steady improvement. Zenyatta then emerged as an even greater champion, winning 19 consecutive races over three years, including the 2009 Breeders' Cup Classic against an all-male field. Shirreffs used unorthodox methods like putting cotton in Zenyatta's ears and giving her Guinness beer to help the high-strung mare stay calm.

  • Shirreffs began training horses in 1976.
  • Giacomo won the Kentucky Derby in 2005.
  • Zenyatta won the Breeders' Cup Classic in 2009.
  • Zenyatta's 19-race winning streak spanned 2007 to 2010.
  • Shirreffs passed away on February 12, 2026.

The players

John Shirreffs

An innovative horse trainer who guided Giacomo and Zenyatta to major victories in his nearly 50-year career.

Giacomo

A 50-1 long shot who Shirreffs trained to a shocking victory in the 2005 Kentucky Derby.

Zenyatta

A spectacular mare who Shirreffs trained to 19 consecutive victories over three years, including the 2009 Breeders' Cup Classic.

Jerry and Ann Moss

The owners of both Giacomo and Zenyatta, who worked closely with Shirreffs.

Mike Smith

The jockey who rode both Giacomo and Zenyatta for Shirreffs.

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What they’re saying

“He did a lot of quirky things to teach her patience. He thought outside the box.”

— Mike Smith, Jockey (The New York Times)

“You're doing great, you're the best ever, thank you for everything you've given me.”

— John Shirreffs (60 Minutes)

What’s next

Shirreffs' final horse, Baeza, is expected to compete in the upcoming Triple Crown races, providing one last chance to honor the legendary trainer's legacy.

The takeaway

Shirreffs' innovative training methods and ability to develop champion horses like Giacomo and Zenyatta cemented his status as one of the all-time great horse trainers. His passing marks the end of an era, but his impact on the sport will be felt for years to come.