His research investigates how urban development patterns intersect with neighborhood livability and environmental quality. These themes are evident in four overarching and interrelated areas of his empirical work: (A) impacts of transit-oriented development, (B) human activity patterns and environmental hazards, (C) urban inequality and access to opportunity, and (D) geographic analytical methods. His scholarship contributes to several literatures – transportation and environmental planning, environmental health science, public health, and geography – and expands each by helping explain how places and policies influence people, behavior, and community health.