Alastair is currently professor of atmospheric science at University of York and Science Director at the UK National Centre for Atmospheric Science. He is a Fellow of the Royal Society of Chemistry and has held their John Jeyes lectureship in Environment, Energy and Sustainability. Alastair's research expertise is in reactive atmospheric chemistry, particularly that of organic compounds in the troposphere and their role in health, ozone and aerosols. He is active in the development of instruments for atmospheric measurements, and the associated chemical metrology, using chromatographic, mass spectrometric and sensor based methods. Alastair is a member of the WMO-GAW science advisory group on reactive gases and works with industry and government on the assessment of hazardous chemicals in the environment.