He has authored or co-authored 11 book chapters, 34 refereed publications, 72 conference proceedings, and 20 research reports. He is recognized as a leader in cattle heat stress research in Australia and internationally. He is part of an international team which has recently developed new thermal stress indices for livestock and a heat stress risk assessment model for feedlot cattle. John is the Treasurer of the International Society of Biometeorology and is a member of the Editorial Advisory Board for the International Journal of Biometeorology.