 After further experience in process investigation and commissioning in the Technical Department, in 1961 he became assistant works manager on the ICI Olefines Works near Wilton, Redcar and Cleveland.In 1968, he was appointed the first Technical Safety Advisor.During this time, ICI developed hazard and operability studies, now known as Hazop, for which he was an enthusiastic advocate, and the author of the first book on the subject.