Sir John has long-standing experience in both the public and private sectors in New Zealand. He currently acts as Chairman of Marsden Maritime Holdings Ltd and a Director of Northport Limited. He is a former Chair of Metro Performance Glass Ltd, the New Zealand Business and Parliament Trust, NZ Lotteries Commission and NZ Carriers Group, a former Director of the Reserve Bank of New Zealand, Television NZ Limited, Vector Limited and was the inaugural Managing Director of Auckland International Airport Limited.
In 2003, Sir John was appointed the New Zealand Herald Business Leader of the Year and a Distinguished Companion of the New Zealand Order of Merit (DCNZM) for services to business and the community. This honour was re-designated as Knight Companion of the New Zealand Order of Merit (KNZM) in 2009.
Sir John is a graduate of Harvard Business School (Advanced Management Program), a Justice of the Peace and a Fellow of the New Zealand Institute of Management. He was inducted as a Laureate into the New Zealand Business Hall of Fame in 2003.