Interview and questionnaire data obtained from 73 leaders of nonprofit environmentalist and for-profit environmental product and service organizations showed that these leaders' personal values were more ecocentric, open to change, and self-transcendent than those of managers in other types of organizations. These leaders also acted as 'master managers,' performing both transformational and transactional leadership behaviors. As hypothesized, nonprofit environmentalist organizations were highly receptive contexts for transformational leadership, whereas for-profit environmental organizations were at least moderately receptive in this regard. The authors used these findings to develop a preliminary model of environmental leadership.