 Professor Simpson became renowned for his post-mortems on high-profile murder cases, including the 1949 Acid Bath Murders committed by John George Haigh and the murder of gangster George Cornell, who was shot dead by Ronnie Kray in 1966.He pioneered forensic dentistry, and was prominent in alerting physicians and others to the reality of the battered baby syndrome.Professor Simpson wrote a standard textbook on his subject and edited "Taylor's Medical Jurisprudence", a basic work of reference of the British medical profession.