This book argues that public governance is changing so rapidly and profoundly that public administration research is struggling to keep up and to keep track of the changes and their various implications. A broad range of well-established principles, perceptions and forms of governing in the public sector are being challenged by new ideas, concepts and practices that, when taken together, are transforming the modus operandi of public governance. Hence, new and emerging forms of political leadership, public management, public organization, administrative steering, cross-boundary collaboration, public regulation and societal problem-solving are being combined with new digital technologies and a novel focus on the production of innovative public value outcomes.The pace of governance changes has accelerated in recent decades. After half a century of an almost undisputed reign of liberal democracy and public bureaucracy, New Public Management (NPM) reforms swept the world beginning in the late 1970s. Despite their positive impact and results, these NPM practices soon gave rise to an array of criticisms that, in the subsequent decades, spurred the proliferation of several new governance paradigms. Hence, public administration researchers started talking about the Neo-Weberian State (Pollitt & Bouckaert 2011), Digital Era Governance (Dunleavy 2006), Public Value Management (Benington & Moore 2010) and New Public Governance (Osborne 2010). In many cases, the new ideas about public governance triggered reforms, resulting in new practices. While it is difficult to explain the growing pace of public governance reforms, globalization, new technologies, growing citizen demands and the recognition of the planetary limits seem to have disrupted the established forms of public governance and have engaged elected politicians, public managers and an army of private consultants in experimentation, learning and innovation diffusion. In other words, changes in the public sector reflect both external societal change and internal agency-based learning and entrepreneurship.The COVID-19 pandemic has further accelerated the transformation of public governance. Against a tragic background of illness, death and economic hardship, public sectors around the world have produced numerous innovations in response to the immense pressures from the pandemic, lockdowns and the new health regulations. These crisis-induced innovations have transformed both the form and function of administrative systems and the provision of services to citizens (Torfing et al. 2022). Some of them might vanish with the