Advances in Group Processes publishes theoretical analyses, reviews and theory based empirical chapters on group phenomena. Volume 23 includes papers that address fundamental issues relating to the Social Psychology of the Workplace. Chapter one uses a social identity perspective to understand the emergence of social capital and cooperative behavior in the workplace. The second and third chapters address issues of leadership. Chapter two reviews the social psychological literature on leadership, and contrasts this with leadership literatures which tend to be more applied (and positive) in nature. The third chapter offers a new theory of leadership that centers on the importance of leadership vision and self-sacrifice. As a group, these chapters address new empirical and theoretical problems at the cutting edge of workplace research.