The practice of leadership traditionally has focused on the role of leaders in managing and protecting group boundaries. Leaders often operate within their box on the organizational chart, within the interests of their unit or team, and within the mind-sets of the demographic or cultural groups...

As structural and technological boundaries are dismantled, a flat world of boundaryless organizations gives rise to a different type of boundary found in intergroup relations. In organizations worldwide, leaders are challenged to bridge social identity boundaries between groups of people with...