John grew up Lewes, Sussex, the son of the trainer Towser Gosden. After graduating from Cambridge University, he moved to Newmarket to become an assistant to legendary trainer Sir Noel Murless. In 1977 he moved to Ireland as assistant to champion trainer Vincent O’Brien. The following year John crossed the Atlantic to California and in 1979 he began his training career.
John trained over 500 winners during his time in California before returning to England in 1989 to train for Sheikh Mohammed from Stanley House Stables, Newmarket. In 2000 John moved to Manton, Marlborough, where he enjoyed further success before returning to Newmarket and Clarehaven Stables in 2006, which has been his base ever since.
Married to Rachel, they have four children. In 2021 he joined forces with his son Thady when the pair took out a joint training licence.
Prior to taking out a joint licence with John, Thady worked alongside his father for several years at Clarehaven, including during breaks from university and when not acquiring experience of training operations abroad.
After graduating from Bristol University and before settling down at Clarehaven, Thady spent time with some of the world’s leading trainers, working in Australia, Ireland and North America.
Returning to Newmarket, he was assistant to his father before the pair became joint licence holders in 2021. Within just over a month, the combination had won the Saudi Cup, the Dubai Turf and the Sheema Classic – winning more than £11m in prize money in the process – and later that season the pair cemented their standing when they were leading trainer at Royal Ascot.