He has worked with the Oil and Gas sector, both upstream and downstream, commercial and military aviation, shipping, mining and hospital medicine. He was one of the developers of the Tripod model for Shell, together with Jim Reason and Willem Wagenaar, better known as the Swiss Cheese model. He was part of Shell's team developing the theory of SMS in response to Piper Alpha and am now involved in teaching and developing SMS concepts in Civil Aviation, primarily in Asia and Australasia. He also developed the HSE Culture ladder, together with Dianne Parker and is now working on improving concepts of risk analysis in hospital medicine, transferring knowledge and experience between industries.