Stathis N. Kalyvas (Greek: Στάθης Ν. Καλύβας, born 7 March 1964) is a Greek political scientist who is the Gladstone Professor of Government, at the University of Oxford and a University Academic Fellow at All Souls College, Oxford. He has held professorial positions at Yale University (from 2003 to 2017), as well as the University of Chicago, New York University, and Ohio State University. He has also conducted research at the Peace Research Institute Oslo.[1][2][3] Kalyvas has written extensively on civil wars, ethnicity, and political violence.[4] He wrote The Logic of Violence in Civil War.