My research interest is measuring and modelling emissions from the surface of the Earth. To date I have investigated ammonia emissions from seabird colonies, nitrous oxide and nitrogen oxide emissions from natural and synthetic fertilizers and methane from landfills. This field of study envelops my two preferred research areas: understanding the movement of trace gases, from an emission source through the boundary layer, and developing tools and methodologies to estimate the size of emissions created by biogeochemical processes.