John Bevan has been involved in diving all his life. He has worked for the Ministry of Defence as a research scientist in diving physiology, for Comex Diving Ltd, a North Sea diving company as Technical, Training and Safety Manager and has been the managing director of his own underwater consultancy company, Submex Ltd, since 1976. In his consultancy role, he has worked for four European governments and most of the major oil companies operating in the North Sea. Seeing a demand for technical literature for commercial divers, he wrote and published The Professional Diver's Handbook. It has become the international best-seller in its field and is currently in its second edition. He first came to public notice in 1970 when he and a colleague undertook the world record, saturation, chamber dive to 1500 feet. This was the greatest pressure that any human had ever withstood and they crashed through the "Helium Barrier". It was described by the Americans as a "hyperbaric moon-landing"! In 1990, John helped form The Historical Diving Society and was elected it's founding chairman, a position he still holds. Daughter societies have since been formed in over 20 countries worldwide. After gaining a PhD in the history of diving, he wrote The Infernal Diver, the definitive reference book on the invention of the diving helmet. This was followed by Another Whitstable Trade, the definitive history of the global diving industry (in press). John continues to work as a consultant and has become the UK's leading diving expert investigating diving accidents in litigation cases. He often appears on television as an expert providing commentaries on technical aspects of diving. He is the editor of the diving trade magazine Underwater Contractor International and the Industry Consultant for Diver magazine. John is married and has two grown up children. He now lives in Alverstoke, near Gosport in Hampshire, UK.