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Professor, Department of Civil and Environmental Engineering, Pennsylvania State University, 2013-present. Visiting Scholar, Department of Civil and Environmental Engineering, University of California at Berkeley,

2011-2012. Visiting Research Engineer, Institute of Transportation Studies,

2011-2012. Visiting Research Engineer, Institute of Transportation Studies, University of California at Berkeley, 2013-present. Associate Professor, Department of Civil and Environmental Engineering, Pennsylvania State University,

2004-2013. Graduate Faculty, Operations Research Program, College of Engineering, Pennsylvania State University, 2007-Present. Faculty Affiliate, Protective Technology Center, Pennsylvania State University,

2010-2015. Affiliate Faculty, Department of Civil and Environmental Engineering, University of Washington, Seattle, 2004-2007. Assistant Professor, Department of Civil and Environmental Engineering, University of Washington, Seattle,

1999-2004. Affiliate Assistant Professor, Interdisciplinary PhD Program in Urban Planning, University of Washington, Seattle,

2002-2004. Safety Program Research Manager, Washington State Department of Transportation, Olympia, 1996-1999. Transportation Engineering Consultant, Division Manager and Principal, Seattle, WA, 19891996. Graduate Research Assistant, University of Washington, Seattle, 1993-1996, 1988-1989.