This book examines the transformation of the administrative state, since it was first coined by Dwight Waldo seventy years ago. Empirically, the book assesses how the administrative state is facing endogenous reforms through administrative devolution, as well as exogenous shifts by the rise of multilevel administrative systems and international bureaucracy. Facing dual shifts, the book offers a comprehensive analysis of how the administrative state handles three interconnected challenges: first, a need for innovation and reform, as well as stability and robustness; second, administrative autonomy among regulatory bodies, as well as political leadership and democratic accountability; and third, nation-state sovereignty and international collaboration. It also highlights the robust character of the administrative state by demonstrating profound stability in public governance even during times of profound turbulence. It will appeal to scholars and students of public policy, public administration and global governance, as well as practitioners interested in new developments in public governance.