David G. Ortiz is associate professor of Sociology at New Mexico State University. Previously, he spent one year as a fellow at the Center for the Study of Political Change at the University of Siena in Italy, and was faculty in Sociology and Latin American studies at Tulane University. His current research agenda focuses on the influence of time on contention-repression dynamics, the effects of disasters on social movements, the relationship between digital media and activism, and state repression and mobilization in Latin America. His work has been published in Sociological Perspectives, Sociological Inquiry, the American Journal of Cultural Sociology, Qualitative Sociology, and Mobilization, among others. Dr. Ortiz has served as an international election observer in several elections throughout Latin America, including the 1994 Mexican elections with Alianza Civica, and the 2004 Venezuelan Referendum with the Carter Center and the OAS. He was born in Mexico City and received his Ph.D. in Sociology from the University of Notre Dame. He is founding editor-in- chief of Mobilizing Ideas, the leading scholarly blog on social movement research.