I use a range of mathematical modelling and analysis tools to describe and understand how cropping system processes are influenced by management and their environment (climate, CO2, water, nutrients, ozone,…). I am particularly interested in looking at how the response of cropping systems change when considered from different scales to understand how impacts at one scale affect systems at other scales. Another research interest of mine is in integrated systems modelling and the ability of such frameworks to help us understand complex problems such as food security, climate and land use change. With such understanding, scientific assessments of how best to increase the resilience of human-environmental systems and their ability to provision ecosystem services can be added to the mix of information needed by decision makers.