Paul's primary research interests involve non-market valuation of environmental goods. He has studied the economics of recycling and recreation, especially the role of fish consumption advisories in explaining angler behavior. His recent research interests involve behavioral responses to the risks of exposure to environmental contaminants such as mercury and arsenic. His research has appeared in leading environmental economics journals. Paul has served as an associate editor of J. Agricultural and Resource Economics, Water Resources Research, and Society and Natural Resources.
A long-time rock-climber whose shoulder injuries have finally caught up to him, Paul has recently become an avid cyclist.