I am a transportation geographer and spatial analyst. My research investigates the social and economic outcomes of transportation and land use decision making in urban areas. I am currently working on projects related to the distributional aspects of transit accessibility, personal mobility, and participation in the activities of daily life. I have authored more than 40 peer-reviewed journal articles and book chapters, am on the editorial board of three international geography and transportation journals, and I chair the Social and Economic Factors Committee at the Transportation Research Board, one of the US National Academies of Science.