I am broadly interested in the etiology, phenomenology, and treatment of disorders of anxiety and fear. Specifically, I employ experimental fear conditioning paradigms to explore factors that contribute to the etiology and maintenance of fear/anxiety as well as to explore mechanisms involved in the extinction of conditioned fear. These studies utilize physiological, behavioral, and self-report indices. I also study the measurement, phenotypic structure, and temporal stability of anxiety and mood symptomatology using structural equation modeling with cross-sectional and longitudinal observational data.