About the Author: Ernst Joachim Wolfgang Stroebe is a German social psychologist and Emeritus Professor of Social Psychology at the Utrecht University and the University of Groningen, particularly known for his works "Introduction to social psychology" and "Social psychology and health," and on brainstorming. Miles Ronald Cole Hewstone is a leading social psychologist who is well known for his work on social relations. He graduated from the University of Bristol in 1978 and then moved to the University of Oxford from which he obtained a D.Phil. in social psychology in 1981.