This paper uses evidence about transformational forms of leadership in schools provided by 32 empirical studies published between 1996 and 2005 to answer questions about the nature of such leadership, its antecedents, and the variables that both moderate and mediate its effects on students. Results indicate significant, primarily indirect effects of this form of leadership on both student achievement and engagement in school. These effects are mediated by school culture, teachers’ commitment and job satisfaction, and a small number of other variables. Few studies have examined the antecedents or moderators of transformational school leadership.