Nicholas is an Upper GI and Bariatric surgeon who works in both private and public practice at Auckland Hospital. He completed a thesis in paediatric surgery in the Netherlands and London before completing ANZGOSA (Australia and New Zealand Gastro Oesophageal Surgery Association) and OSSANZ (Obesity Surgery Society of Australia and New Zealand) accredited post fellowship training programmes in Upper GI and bariatric surgery.

He offers a wide range of bariatric procedures (including Roux-en-Y gastric bypass, one anastomosis gastric bypass, and sleeve gastrectomy), anti-reflux surgery, gallbladder surgery, and hernia surgery.  He has a particular clinical interest in minimally invasive surgery for oesophageal and gastric cancer, and has successfully implemented a minimally invasive oesophagectomy programme at Auckland Hospital.