Andrew Jefferies has led New Zealand Oil and Gas (NZOG) through an action-packed three-year period when the company has fended off a hostile takeover offer, adjusted to having a new owner, dealt with a sledgehammer government policy decision and launched a reinvigoration process for future growth.

Jefferies likes to tell anyone who does not know NZOG that it is the largest and smallest publicly listed upstream company in the country.

It fulfils both roles by virtue of being the only oil and gas company on the local bourse.