Career
He is a contributing editor for the International unidentified flying object Reporter and has been the Australian representative for the Aerial Phenomena Research Organisation (1978 to 1986) and a New South Wales state representative for the Mutual unidentified flying object Network (1976 to 1993). Chalker was born in Grafton, New South Wales in 1952. He studied at the University of New England, receiving a degree in chemistry and mathematics.