Leadership research has not settled on one definition, but all agree that leaders influence others to achieve goals. Cross-cultural psychologists study different leadership theories and how they apply across cultures. They also look at how certain leadership styles are tied to specific cultures. Some key theories include consideration and initiating structure, transactional and transformational leadership, leader-member exchange theory, and charismatic leadership. Current trends in leadership research focus on women in leadership, e-leadership, and servant leadership.