Government employees develop classified knowledge, operational relationships, and technical expertise that remain valuable for decades after they leave government service. When they transition to defense contractors, consulting firms, or corporations, they carry this expertise with them-creating conflicts of interest, national security vulnerabilities, and opportunities for elite enrichment that weak regulations fail to prevent. Yet these transitions operate almost entirely in the shadows, far less visible than the political revolving door that dominates public debate. From Washington to Beijing, from London to Moscow, intelligence and diplomatic expertise flow between government and business with minimal oversight and rare consequences.

In Search of Expertise provides the first comprehensive analysis of how 22 countries plus the European Union manage these transitions-and why their approaches consistently fail. Drawing on more than forty years of research, observation, and experience across international business, government service, and diplomacy, the book reveals how cultural attitudes shape what's visible as a problem (France celebrates pantouflage while Germany restricts it), why informal networks matter more than formal rules everywhere, and how enforcement becomes the defining variable separating countries that succeed from those that don't. With detailed case studies and calibrated policy recommendations, this book shows what actually works when countries commit to protecting public interests over elite privilege-and why meaningful reform remains so difficult, even though it is achievable.