These laid the foundations for a tribal asset portfolio that currently stands in excess of $1.8 billion and set a number of benchmarks for the historical Treaty claims process.
He helped negotiate and shape legislative responses to Māori interests in fisheries, both commercial and non-commercial and was the founding chair of Te Ohu Kaimoana (Treaty of Waitangi Fisheries Commission).
Sir Tipene was the founding assistant vice-chancellor (Māori) at the University of Canterbury until 2011.
He was deputy chair of Transit New Zealand from 2000 to 2006, and a member of the New Zealand Geographic Board from 1985 to 2013, making a significant contribution to its bi-cultural evolution and publications.
Named Kiwibank New Zealander of the Year earlier this year, O'Regan said being recognised in the list came as a shock.
He plans to celebrate with his family, surrounded by his 13 grandchildren and great-grandchildren.
O'Regan, together with fellow Order of New Zealand appointee Dame Silvia Cartwright, leads this year's 187-strong honour list, which also includes three new Dames (Ruth Aitken, Judge Carolyn Henwood and Judith McGregor) and three new Knights (Patrick Hohepa, Hugh Rennie, Collin Tukuitonga).