I hold appointments at the University of Michigan as Professor of Earth and Environmental Sciences and Curator of Invertebrates at the Museum of Paleontology. My research focus is on the evolutionary impacts of biotic interactions, functional morphology, biomechanics, and taphonomy. In addition to studying fossils in the field and in museums, I also work on modern organisms using scuba and submersible observations, conduct laboratory experiments, and use computer and physical modeling.