Gunther Bonnin form Oregon in the USA was stationed as an intelligent officer in Brisbane during WWII. In this capacity he was commissioned to the Netherlands Forces Intelligence Service (NEFIS). He apparently wrote a paper on Sukarno as part of his intelligence work. He was probably also a translator.
After the war Gunther married in Brisbane Nancy Crowe ( a Brisbane socialite). They move to America but it looks like they came back to Australia in 1963. They had a daughter Margriet Bonnin (interestingly the Dutch spelling of the name Margaret) . She was born in 1949 and died in Brisbane in 2022. Margriet is also a person of notability.