Measday's professional career began as a cadet journalist with the Australian Broadcasting Corporation, where he worked as a reporter, sub-editor and news director. He was an ABC/freelance journalist (1969-1978); co-editor of Stelarc (1976) and Administrator/Production Manager of the Troupe Theatre Company (1978-1979). He then became a freelance writer. Measday wrote for both adults and children in film, television and radio, and worked for three series as script editor on the Logie Award-winning Channel 9 program, HI 5. He also wrote for Australia's highest rating drama, Blue Heelers, the adaptation of the Paul Jennings/Morris Gleitzman books, Wicked, the 10 network children's series, Mirror and Mirror 2, ABC TV's The Ferals, Channel 9's Ship to Shore; as well as an original telefeature, The Time Game; and the ACTF series, Skytrackers 2. His novels have been published in Australia, the United States, France, the United Kingdom, Indonesia and South Korea. Measday conducted a range of workshops, talks and readings throughout Australia for primary, secondary and tertiary students as well as adult groups. He also taught scriptwriting at the University of Western Sydney.