He is a core faculty member in the Landscape Architecture graduate program and the undergraduate major in GeoDesign. He is a Faculty Affiliate of the GIS Research Laboratory and the Wrigley Institute for Environmental Studies and serves as Science Director of The Urban Wildlands Group, a Los Angeles-based conservation nonprofit. From 2008 to 2015 he was Associate Professor (Research) in the Department of Geography and then the Spatial Sciences Institute at USC, while also serving as Adjunct Associate Associate Professor at the UCLA Institute of the Environment and Sustainability through 2014, where taught the senior practicum in Environmental Science. From 2000 through 2009 he was a research associate and associate director of the USC Center for Sustainable Cities.