John joined 'The Bank Line' of Glasgow and London from school at age 16 in 1975. His studies and subsequent career at sea in the merchant navy took him from Junior Engineer through the ranks to become Chief Engineer at the age of 28.
In 1989 he joined the Salvage Association, becoming Regional Manager of BMT Salvage Ltd. for the Americas in April 2001.
He opened the New York office of the Noble Denton Group of Companies in July 2007 as President, heading up their "Marine Casualty Investigation Division" for the Americas.
In 2012 John became Executive V.P. and Principal Surveyor of Atlantic Marine Associates, which provides marine surveying, consulting and expert witness services from their offices in the U.S. and London.
He now has forty years' experience in marine engineering, surveying, consulting, claims, loss prevention and provision of expert opinion.