David is joining the faculty of the Department of Neurobiology in the fall of 2013 as the Edward R. and Anne G. Lefler Professor of Neurobiology. An Investigator of the Howard Hughes Medical Institute, David has worked for over two decades to unravel the mysteries of peripheral nervous system (PNS) development and neuronal growth factor signaling. His work has revealed mechanisms of long-range retrograde neurotrophic factor survival signaling in developing sympathetic neurons, the control of synapse formation, and axon guidance events that direct the formation of PNS circuits. A current focus of the laboratory is the development, organization, and functions of mechanosensory circuits that underlie the sense of touch. This work has elucidated principles underlying mechanosensory neuron maturation, circuit formation, and function, and a core logic of somato-sensory neuron organization.