In this chapter the authors focus on the role of power associated with microfoundations of organizational hybridity. They develop a framework that illuminates how key sources of power based on Buchanan and Badham (2008) and French and Raven (1959) manifest at the level of everyday work practices. Using this framework, they draw on existing studies concerning hybridity in professional organizations to illustrate how different forms of power come into play when actors guided by different logics engage in day-to-day professional work. Overall, the authors suggest that more attention to how micro-level actors use different forms of power to support, hamper, or alter different mechanisms to manage tensions among competing logics in everyday work is critical to improving our understanding about the microfoundations of institutionalism.