Dan Klingenberg's research group focuses on understanding the behavior of suspensions of various kinds. Suspensions of small particles that can be controlled by external fields (electro- and magnetorheological fluids) find applications in areas ranging from active damping and energy-efficient torque transfer devices in automobiles to robotic actuators. His research in the rheology of biomass—suspensions of natural fibers—is directed toward finding efficient and economical ways of producing fuels and other chemicals from biomass feedstocks.