Jeff Gruenewald, Ph.D, is the director of the Terrorism Research Center and associate professor in the Department of Sociology & Criminology at University of Arkansas. He serves as principal investigator for the American Terrorism Study and U.S. Bias Homicide Database and as co-principal investigator for the U.S. Extremist Crime Database. His current work is funded by the National Institute of Justice (Department of Justice) and applies Risk Terrain Modeling techniques to American terrorism cases and provides a web platform for U.S. attorneys and homeland security professionals to access data on terrorism, violent extremism, and criminal justice responses to various forms of targeted violence.