After a rapid succession of business acquisitions that included the purchase of Pepsi Cola NZ, he now divides his time between New Zealand and the United States where he lives with his wife Susan in Newport Beach, Los Angeles.
In the Bay of Islands, Mr Cooper developed the secluded The Landing at the southwestern tip of the Purerua Peninsula and built several luxury houses.
The Cooper family have a villa nestled in a wildlife sanctuary between a vineyard and the sea which is available to rent for about $7000 a night.
Sir Michael Hill comes in second on the rich list for Northland and his wealth also increased, from $290 million in 2015 to $300 million this year. The founding owner of jewellery firm Michael Hill International now lives in his $6.25 million hilltop property in Arrowtown.
Another Bay of Island resident, Peter Kraus, is the third Northlander on the Rich List worth $115 million this year - up from $105.9 million last year.
He lives on a $3 million property in Kerikeri and his Ebos Group is Australasia's largest and most diversified healthcare, medical and pharmaceutical product supplier.