· Associate Professor of Information Studies, University of Maryland, College Park2013–
· Assistant Professor of Information Studies, University of Maryland, College Park2007–
· Adjunct Professor, American University2006–
· Faculty Research Associate, Institute for Advanced Computer Studies, University of Maryland2005–
· Research Director, Joint Institute for Knowledge Discovery, University of Maryland2005–
· Adjunct Professor, Johns Hopkins University2002–
· Adjunct Lecturer, George Washington University2001–