My research covers many areas of theoretical ecology.  The overarching theme is the use of “individual-based” or “structured” population models to relate population dynamics to the physiology and behavior of individual members of a population. Recently, much of this work has used Dynamic Energy Budget (DEB) theory, where I collaborate closely with several European research groups. DEB theory uses systems of equations to describe the rates at which individual organisms assimilate and utilize energy and elemental matter, and my research group both develops new fundamental theory and applies it to environmental problems.  Current applications include ecotoxicology, coral biology and fish bioenergetics. I am on the Executive Committee of the University of California Center for Environmental Implications of Nanotechnology, and am an investigator in the Moorea Coral Reef (MCR) LTER project.  I am also continuing some work on a long-standing interest: population dynamics in streams and rivers.