Retired out of Auckland, New Zealand from his multi million dollar advertising agencies to a tranquil mountainside home in Honolulu Hawaii, where he took up painting as a hobby in 1978. Within a few months painting consumed him totally.
Jacka studied at the Honolulu Academy of Art under two acknowledged watercolourists Robert Wood and Bob Lendrum of California.
He has held a number of highly successful one man shows in Honolulu, Maui and Auckland. His work has been purchased by the Hawaiian Council for the Arts, by major hotel developers and in private collections throughout the Hawaiian Islands, Hollywood, Washington, New York, Hong Kong, London and Canada, New Zealand and Australia.
Jacka majored in dramatising the lush plantations of Hawaii, the sugar cane fields and papaya, pineapple and banana plantations.
1987: Auckland exhibition, 25 major works of the interiors of the old colonial homes under the protection of the NZ Historic Trust.
He is acclaimed for his interpretation of flowers, painting them with the strength and boldness of an oil painter. Up to six feet long, with some of his diptyches extending to 15 feet.