Dr Cossburn qualified from the University of Wales College of Medicine in 2000. After completing medical and neurological training in Southampton and South Wales he was appointed to Poole hospital as an NHS consultant in 2012. Dr Cossburn leads the headache service in Dorset, a specialist service delivering interventional treatments including nerve blocks and botulinum toxin. This service also receives NHS referrals from Hampshire, Wiltshire and the Isle of Wight. He also has a keen interest in Multiple Sclerosis (MS) and other immune diseases of the central nervous system with special expertise in the assessment and treatment of patients with early and rapidly evolving disease.