Volunteers are integral to civic and social life, and leadership is integral to keeping volunteers satisfied and committed. However, volunteer leadership research is hindered by the dispersion of leadership theories and the absence of a specialized leader behavior assessment tool. To address this, we developed and validated a four-dimensional scale for evaluating the behaviors of leaders of volunteers. Using confirmatory factor analyses, we confirmed a four-factor, hierarchical model in an Australian emergency volunteer sample. Concurrent validity was confirmed in relation to satisfaction with leadership, overall satisfaction with volunteering experience, and affective organizational commitment. Further details of quantitative studies for scale evaluation are provided. This study provides researchers and practitioners with a valid and reliable instrument to assess different aspects of effective leader behaviors within the volunteering context. Implications, limitations, and future research directions are discussed.