Dan Tunstall Pedoe was the medical director of the London Marathon for 25 years between the first one in 1981 until 2005. In 2003, Pedoe was shadowed by Sanjay Sharma from St George's Hospital (University of London) who took over the role in its entirety in 2006. Medical cover is provided by 150 doctors. Also assisting were more than 1,500 volunteers of St. John Ambulance, who organise over 50 first aid posts along the route, and three field hospitals at the finish. St John Ambulance also provide a number of healthcare professions for the event, including nurses, paramedics, ambulances with crews.