Ian began his career in the New Zealand Government Treasury in 1977. Before leaving the Treasury in the mid 1980s he was involved in a number of cost-benefit analyses of energy projects and as course director for a project evaluation and national cost-benefit analysis course. He spent the next nine years in the New Zealand capital markets mainly with a mergers and acquisitions and business valuation focus. Since 2000, Ian has been financial and economic consultant. He has prepared a number of economic benefit assessments of economic development proposals and been engaged to peer-review others. He has also worked with the Better Business Case framework.
Ian has governance roles as a director of the commercial arms of the Ngāti Makino and Ngāti Rangitihi. He is also a member of the investment committee of the Te Pūia Tāpapa Fund.