JPR has extensive experience in developing novel single particle techniques to study microphysical aerosol processes. His current research is relevant to atmospheric science, drug delivery to the lungs, formulation science and disease transmission, and is funded by the EPSRC, BBSRC, MRC and NERC. He has held both an EPSRC Advanced Research Fellowship and an EPSRC Leadership Fellow. He was co-editor of Fundamentals and Applications in Aerosol Spectroscopy (Taylor & Francis, 2010, edited with Prof. Ruth Signorell, ETH-Zurich) and has over 220 publications in peer-reviewed journals.