Notwithstanding the proliferation of servant leadership studies with over 100 articles published in the last four years alone, a lack of coherence and clarity around the construct has impeded its theory development. We provide an integrative and comprehensive review of the 285 articles on servant leadership spanning 20 years (1998–2018), and in so doing extend the ﬁeld in four diﬀerent ways. First, we provide a conceptual clarity of servant leadership vis-à-vis other value-based leadership approaches and oﬀer a new deﬁnition of servant leadership. Second, we evaluate 16 existing measures of servant leadership in light of their respective rigor of scale construction and validation. Third, we map the theoretical and nomo logical network of servant leadership in relation to its antecedents, outcomes, moderators, mediators.We ﬁnally conclude by presenting a detailed future research agenda to bring the ﬁeld forward encompassing both theoretical and empirical advancement. All in all, our review paints a holistic picture of where the literature has been and where it should go into the future.
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