Mark Johnston becomes Grass Sickness Fund Ambassador
The Equine Grass Sickness Fund Chairman Philippa Gammell is delighted to announce that Mark Johnston, one of the UK’s most successful racehorse trainers, has become the Fund’s very first Ambassador.
Mark trained as a vet at the Glasgow Veterinary School, but after three years in practice, decided to follow his heart into racing. In 1987 he gained his trainers licence and sent out his first winner, Hinari Video, and the following year set up his yard in Middleham, North Yorkshire. Since then he has achieved astonishing success, training more than 100 winners in 17 consecutive seasons, and winning the 1,000 and 2,000 Guineas, the Ascot Gold cup three times, and the Goodwood cup five times. In 2009 Mark not only became the first Flat trainer to send out over 200 winners in a season, but did it all over again in 2010.
Mister Baileys, one of Mark’s greatest horses, owned by Baileys Horse Feeds, gave both trainer and owner their first Classic win in the 2,000 Guineas at Newmarket in 1994, in a record time that still stands. Tragically Mister Baileys suffered chronic grass sickness as a three year old shortly afterwards, and is the most famous survivor of the disease. In spite of considerably reduced gut and liver function, Mister Baileys spent several years standing at stud, initially in the U.S., and later returned to the U.K. to the Whitsbury stud. Following retirement from stud duties he died at the age of 18.
Kate Thomson, Administrator for EGSF said ” We are indebted to Mark for becoming our Ambassador. Grass Sickness is a devastating disease that paralyses gut function in 1-2% of the UK’s horse population, and is fatal in over 90% of cases, yet the definitive cause of the disease remains unknown. Many horse owners are still unaware of the disease, and we hope that with Mark’s help the Fund will gain a higher profile, to help us raise awareness and badly need funds for research.”
At the Equine Grass Sickness Fund (EGSF), we are dedicated to one goal: finding the cause of Equine Grass Sickness and helping to protect future generations of horses, ponies and […]
Tickets are available for the upcoming Equine Grass Sickness Conference, held at the Moredun Institute on 25th March 2026. The link to buy tickets can be found here: https://www.tickettailor.com/events/equinegrasssicknessfund1/2026000 In-person […]
The EGSF office will be closed on Christmas Eve, inclusively until we return to office on 5th Jan 2026. The email inbox will not be monitored during this time, and […]

