Koroknay was formerly a councillor of Australian Petroleum Production and Exploration Association Limited and the chairman of the Advisory Board for the School of Petroleum Engineering at the University of New South Wales.
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Before becoming the Technical Manager of Esso's upstream activities in Australia, he was the Assistant Area Manager for the Esso/BHP Bass Strait operation, which at the time included twelve offshore platforms producing oil and gas, associated pipelines and three onshore processing plants.
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