Dr Hall qualified from the Middlesex Hospital Medical School in 1982. After junior posts in Gloucestershire, he specialised in rheumatology and internal medicine at St Bartholomew's and St Thomas's Hospitals. He became a Consultant in 1996 and held posts at St Peter's Hospital, Chertsey and then at The Royal London Hospital. He became a full time private practitioner in 2009.

He has carried out research in osteoporosis and metabolic bone disorders and spent a year completing his academic studies at the Hopital Edouard Herriot in Lyon, France. He has published several papers relating to osteoporosis and the effects of hormones on arthritis.

His 3 private practices are at 30 Devonshire St in Marylebone, The Lister Hospital in Chelsea and The Broadgate Spine and Joint Clinic in the City, near Liverpool St. He has admitting rights to The Princess Grace and The Lister Hospitals.

He is a member of the British Society of Rheumatology, the National Osteoporosis Society, the Royal Society of Medicine and the Chelsea Clinical Society. He is listed in The Tatler's review of top private doctors.