Mark has been diving since 1987 and has been teaching since 1994. He has been a full time technical diving instructor since 2004 and teaches at all levels up to and including Advanced Trimix. He is a regular contributor of Sport Diver Magazine and has a monthly Technical feature discussing different aspects of technical diving. Mark represents TDI on the British Diving Safety Group as well as being a member of the Diver Training and Breathing Apparatus committees at the British Standards Institute. Mark has also served on the national executive of the Sub Aqua Association as well as being the Technical diving Advisor to this agency. In 2008 Mark published Deco for Divers, a widely acclaimed overview of the theory and physiology of decompression. This has quickly become the standard text on the subject and is recommended reading by a number of the technical diving agencies. In 2010 Deco for divers was awarded "Publication of the Conference" at the EuroTEK2010 technical diving conference. In 2014 the book also won the Media Award at TekDiveUSA 2014. Mark's passion is wreck diving and spends all his spare time diving the wrecks around the coastline of the UK and abroad and has led expeditions to a wide range of locations around the world.