**DAVID A. SNOW *is Distinguished Professor Emeritus of Sociology at the University of California, Irvine. A recipient of multiple lifetime achievement awards, he has published extensively on social movements, collective behavior, and homelessness, with over 150 scholarly articles and 12 books.DOUG ...

**DAVID A. SNOW *is Distinguished Professor Emeritus of Sociology at the University of California, Irvine. A recipient of multiple lifetime achievement awards, he has published extensively on social movements, collective behavior, and homelessness, with over 150 scholarly articles and 12 books.DOUG McADAMis Ray Lyman Wilbur Professor Emeritus of Sociology at Stanford University and former Director of the Center for Advanced Study in the Behavioral Sciences. A widely cited political sociologist, he is the author or co-author of 18 books and more than 100 articles.DANA M. MOSSis Associate Professor of Sociology at the University of Notre Dame. Her research examines resistance to authoritarianism, diaspora mobilization, and repression in transnational contexts. She is the author of The Arab Spring Abroad * and numerous academic articles.