Josh graduated from the University of Edinburgh in 1985 and spent 4 years in equine practice before moving to a residency in equine medicine at the University of Cambridge. He completed a PhD in virology in 1994 and was a lecturer, then senior lecturer in equine medicine at Cambridge. He moved to the Royal Veterinary College, London in 2005 where he is professor of equine clinical studies. He has research interests in equine infectious diseases. He is a past president of the British Equine Veterinary Association, the European College of Equine Internal Medicine and of the Federation of European Equine Veterinary Associations. He was biosecurity advisor for the 2008 and 2012 Equestrian Olympic Games and the 2014 and 2018 World Equestrian Games. He is a co-director (with Jim Green) of the British Animal Rescue and Trauma Care Association (BARTA) and has been the veterinary lead in the large animal rescue initiative in the UK from the start, representing the veterinary profession on the National Fire Chiefs Council. Working with Jim, he has been instrumental in promoting joint training and working between the veterinary profession and the Fire and Rescue Service, including construction of national occupational standards and guidance for the UK Fire and Rescue Service, and building and delivery of FRS and veterinary training courses.