He has more than 25 years experience in epidemiological research, as well as environmental health policy and education. He specialises in the use of spatial epidemiological techniques to investigate environmental health risks using routinely collected health data linked to socio-demographic factors and environmental exposures. The results of his research have been translated into environmental health and health services policy. His current work includes: epidemiological studies into the effects of long term exposure to air pollution on health; health impact assessment of source specific air pollution including fire smoke, wood heaters and energy generation; the relation between the urban environment and health.