This study examined the moderating and mediating effects of emotional reaction and personal power on the relationship of leadership behavior with group morale and organizational commitment. The data were obtained from 289 workers at a steel factory and 425 nurses working at three hospitals. The main results were as follows: 1) Emotional reaction moderated the relationship between performance-oriented leadership behavior and group morale and commitment. 2) Personal power moderated the relationship between Pressure P and group morale and commitment. However, it did not have any moderating effects on the relationships between delegative leader behavior and group morale and commitment. 3) Personal power mediated the relationship between leadership behavior and group morale and commitment, its effects being more pronounced than that of emotional reaction. Finally, the moderator and mediator roles in the leadership process were discussed.