Dr. MacDonald Gibson is interested in research on topics at the interface between environmental science and public policy. Her work focuses on the mathematical quantification of the probability of harm occurring due to environmental contamination and on quantitative comparisons of policy options for environmental risk reduction. She specializes in constructing mathematic models that represent the sources of environmental contamination, how people become exposed to those contaminants, and the types of human health impacts that result from the contamination. Through these models, she explores how changes in public policies affect the level of harm from contamination. Her research has addressed a broad range of environmental risks, from water pollution, to air pollution, to contamination of land with unexploded ordnance.