John's first role as a pathologist was with the British Industrial Biological Research Association (BIBRA), at Carshalton in the UK, where he was head of the electron microscopy unit. He then joined the Pathology Department of ICI Central Toxicology Laboratory in Cheshire, United Kingdom in 1983. He became a member of the UK Royal College of Pathologists in 1988, was elected a Fellow in 1997, and ran the Specialty Advisory Committee for Toxicology from 2002-2005. He was Chair of the Panel of Examiners for the Toxicology Specialty of the RCPath from 2006-2012 and remains an examiner for the College. He was President of the British Society of Toxicological Pathologists from 2002-2004 an...