David has extensive international management experience in the dairy industry as a Group Managing Director of NZ Milk Ltd; Group Managing Director - Global Operations, and General Manager Milk Powder Division for the Dairy Board and Chief Executive of Milk Products Holdings (North America).

David is currently chairman of Prevar Ltd, Heller Tasty and Ruapehu Alpine Lifts. He is a director of Restaurant Brands Ltd, Douglas Pharmaceuticals, Ballance Agri-Nutrients Ltd, Rangatira Limited and subsidiaries (incl Heller Tasty and Contract Resources Ltd), NZ Biotechnologies Ltd, Excelsa Associates Ltd, and Port of Tauranga. He is a shareholder in Taupo Motorsport Park.

He is also a member of Hutt Golf Club, WCC Audit & Risk Management Sub-Committee (independent member) and the College of Queen Margaret College.