He held a number of positions in the Department of Maori Affairs, now Te Puni Kokiri, and lost his job in a 1986 scandal over loans for a Maori business in Hawaii, exposed by then National opposition spokesman for Maori affairs, Winston Peters. Mr Hansen was a kaumatua for the Auckland police and Auckland District Health Board, and was involved in penal reform policy, victim support, restorative justice and rehabilitation.
As a member of the Waipareira Trust, he had a bitter public falling out with John Tamihere over the size of a golden handshake following the former MP's resignation as chief executive, but the pair subsequently made up.
Hundreds of people attended an 80th birthday celebration for Mr Hansen in Auckland's Civic Theatre in June.
During the party, he displayed the humour that had made him so popular, saying the mother of his four tamariki had divorced him because he had flat feet. He brought the house down when he said his feet had been in other women's flats.
Mr Hansen was awarded the Queen's Service Medal in 2010 for services to Maori and the community.