Core expertise in two areas: 1) rheological measurements of challenging-to-measure materials and systems, including biomass slurries, drilling fluids (mixtures of clay, soil, water), partially reacted suspensions, high temperature and pressure systems. This includes interfacial rheological measurements. 2) Microscopy of dynamic colloidal and interfacial systems, including imaging nano-scale and micron-scale particles, proteins, polymers, and surfactants in bulk fluids and at interfaces.