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- Associate Professor, Department of Environmental Science and Policy
- TTP Graduate Group Chair
- TTP Graduate Advisor
- Director, National Center for Sustainable Transportation
- Co-Director, BicyclingPlus Research Collaborative
- Associate Director for Education, ITS-Davis
- Professor, Environmental Science and Policy
- TTP Graduate Advisor
2130 Wickson Hall
- Professor, Department of Civil and Environmental Engineering
- TTP Graduate Advisor
- TTP Graduate Program Coordinator