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I study regional- to global-scale dimensions of agricultural land use and management. A core focus of my research has been to examine nitrogen and phosphorus as bridging elements that connect interdisciplinary themes around agriculture, food, and the environment. My broader work on food systems is typically at the intersection between the biophysical and farm management context that underlies agricultural production and the socioeconomic factors that influence food consumption.  Drawing on both quantitative and qualitative techniques, my collaborative work increasingly explores urbanization and its links to food systems. A goal in this area is to better understand how the demand for food in cities links consumers to farming systems and agricultural landscapes at different scales, including the implications of these configurations for sustainability.