Randall CollinsRandall Collins is the Dorothy Swaine Thomas Professor Emeritus in the Department of Sociology at the University of Pennsylvania. He is, most recently, the author of Violence: A Micro-sociological Theory (2008). Interaction Ritual Chains (2004), and he Sociology of Philosophies: A Global Theory of Intellectual Change (1998). He was president of the American Sociological Association from 2010 - 2011. Read More Read Less