Surgical interests include the management of acute and chronic pancreatitis, pancreatic cancer, and gastro-oesophageal reflux and malignancy. He has published over 250 peer-reviewed manuscripts, raised $7m in grants and given over 100 invited talks, including Visiting Professorships to Harvard, Oxford, Karolinska, Singapore, Capetown, Johannesburg and Delhi. Awarded the Butland Distinguished Medical Science Award (1997), Butland Award for Excellence in Research Supervision (2009), Tertiary Teaching Excellence Award (2009), Gluckman Medal (2012) for distinguished contribution to research in the University of Auckland, elected as an Honorary Fellow of the American Surgical Association (2012) and the James IV Association of Surgeons (2013).