Current Research: My research and teaching focus on the intersection between geographic information science and transportation science. I want to understand how people use mobility and communications technologies to allocate scarce time among activities in geographic space – a perspective known as time geography. I am also interested in the social dimensions of transportation, and the implications of human mobility and accessibility for sustainable transportation, livable communities and public health. My main approach to questions of mobility, livability and sustainability is the development and application of GIS and spatial analysis techniques to extract information from fine-grained mobility and spatio-temporal data.