This study highlights deficits in current leadership concepts; and offers new perspectives through the application of a critical realist analysis. Whilst today’s business world is changing and needs effective leadership to survive, nevertheless, leadership is poorly understood, and current leadership research lacks a unified theory or framework. Such a unified framework is suggested here, based on a layered ontology of leadership. It argues that the causal configuration of leadership – the multiple interacting causes that result in its emergence – is (...) best understood as the interplay between the key mechanism of power, along with human agency and collaborative agency, within specific structural and contextual conditions. This explanation requires a critical realist design of a layered ontology; it would not be possible from the perspectives of either positivism or constructivism. (shrink)