He leads the NHMRC Centre of Research Excellence National Centre for Sleep Health Services Research, which is conducting trials of new models of care for OSA and insomnia in primary care to enhance the ability of primary care to manage sleep health. He has extensive experience in clinical epidemiology and with large population based cohort studies. He is Principal Investigator of the MAILES Sleep Cohort Study, one of the largest community studies of sleep health worldwide, that has provided important insights into the relationships betwwen sleep apnea and health. He is Principal Investigator of the North West Adelaide Health Study (NWAHS), a longitudinal cohort study of 4060 adults with 20 years follow-up. Other work examines the effects of shiftwork on health and the effect of sleep and circadian disruption on health and daytime functioning.