Graduating with a medical degree from Otago University, he worked in London finance with McKinsey & C. before serving as Chief Policy Advisor for the New Zealand Government.
He was CEO of Fairfax in 2006, when it bought Trade Me for $700 million, a deal criticised at the time but later shown to be shrewd.
Directorships include executive chairman of the Hoyts Group, chairman of TradeMe Group and a director of Kathmandu Holdings.
Now an Australian citizen, he maintains his local rugby ties as president of the Players' Association in New Zealand.
He is a co-founder of sport horse breeding company NZPH with Warwick Hansen. Haupouri Station has been in Juliet Hansen's family since 1860. It was through the government role Mr Kirk met Mr Hansen. Mr and Mrs Hansen are building a new home for themselves on one of several lifestyle properties on Haupouri Station, created from a recent subdivision. Mr Hansen said the new home would enable him to concentrate on his businesses.