His research interests are in atmospheric and environmental chemistry, with a focus on particulate, cloud, and indoor chemistry. Specific research topics include: rates and mechanisms of multiphase chemistry in outdoor and indoor environments; the role of particles in promoting the formation of both liquid water and ice clouds; field measurements of VOCs and aerosol composition especially in remote regions such as the Arctic; aerosol chemistry related to wildfires.

Jon has been on the editorial boards of Atmospheric Chemistry and Physics, Atmospheric Measurement Techniques, Scientific Reports, and Journal of Geophysical Research – Atmospheres. He is currently an associate editor for Science Advances. He was a member of the NASA/JPL Data Evaluation Panel for Atmosphere Modeling and co-chair of the 2011 Gordon Conference on Atmospheric Chemistry. He has served on scientific steering committees for the International Global Atmospheric Chemistry project, Max Planck Institute Mainz, and Center for Aerosols and Climate. He has been given the CIC Environmental Research Award and CIC Medal, was made a Fellow of the American Geophysical Union, was elected to the Royal Society of Canada, and won a Killam Research Fellowship. He was the PI of NETCARE (Network on Climate and Aerosols) which won the NSERC Brockhouse Award for interdisciplinary research. Jon is currently the PI of the BBCan (Biomass Burning in Canada) project funded by ECCC