According to National Business Review, Mr Izard's fortune was created through pioneering the local manufacture of tungsten carbide-tipped sawblades that were mainly exported to the United States.
In 1991, he sold the business to US-based Irwin Company and got a double payday when his remaining shares shot up in value after Irwin merged with a bigger company.
Subsequent investments in aviation were less lucrative but his Izard Air Complex at Taupo airport has recently become the base for expanding Inflite air charters.
Mr Izard was awarded an OBE in 1994 and CNZM in 2012. He still has a lucrative property portfolio that includes buildings in Auckland's Queen St (valuation $28million), Parnell Rise ($9.5million) and Mount Maunganui apartments.
Other rich listers with Rotorua connections included Treetops retreat owner John Sax ranked 82 with $150million, owner of Wairakei Golf and Sanctuary Gary Lane with an estimated worth of $305million and the Jhunjhnuwala family ($135 million), which owns Sudima Rotorua.