It is important to note that at no point do Avolio et al. (2009) actually define the term “leadership” in their article. Indeed, the article suggests – as does the list of topics described above – that concepts of leadership take many forms (e.g. authentic, transformational, transactional, complexity, etc.). At one point they do state that “.. . there has been a growing sense of tension in the leadership literature that models of leadership that were designed for the past century may not fully capture the leadership dynamic of organizations operating in today’s knowledge-driven economy” (p. 430). This has given rise to what they call complexity leadership, in which “leadership is an emergent phenomenon within complex systems.” If one takes the view that health is a complex adaptive system, as does Glouberman and Zimmerman(2004) and Plsek and Greenhalgh(2001), then one is led to the conclusion that leadership can be defined only in time-specific contexts and in terms of the qualities and attributes that fit that context. In this view, leadership is constantly transforming in its ideal expression, and studies undertaken at a particular point of time simply reveal a snapshot of ideal leadership at that moment in its transformation.