Thorleif Pettersson, Ph.D. (1975) in Comparative Religion, University of Uppsala, is Professor of Sociology of Religion at Uppsala University, Sweden. He is a member of the Executive Committee of the World Values Survey Association and has published extensively on comparative values research.Yilmaz Esmer, Ph.D. (1977), Stanford University, is Professor in the Department of Political Science and International Relations at Bahçeşehir University in Istanbul, Turkey. His latest books are Politics, Parties and Elections in Turkey (Lynne Rienner, 2002, coedited with Sabri Sayari) and Measuring and Mapping Cultures: 25 Years of Value Surveys (Brill, 2007, coedited with Thorleif Pettersson). Yilmaz Esmer is a member of the Executive Committee of the World Values Survey Association.