Table of contents : Acknowledgements Contents Abbreviations and Archives 1 Introduction 1.1 KnabenPhysik 1.2 “Mecca of Theoretical Physics” 2 Scandinavian Settings 2.1 Experiment Under Theory 2.2 New Blood 2.3 Meanings of Internationalism 3 International Networking 3.1 The Manchester Link 3.2 First German Connection 3.3 New Partners 3.4 The Value of Neutrality 4 A “Kuhnian” Crisis 4.1 The Field in Disarray 4.2 American Voyage 4.3 The Copenhagen Putsch 5 Revolt of the Postdoc 5.1 Marginal Intruders and the Light Quantum 5.2 Inflation and Quasi-Free Postdocs 5.3 Werner Heisenberg’s Wanderjahre 5.4 Quantum Mechanics Community 6 Philosophical Wrangling 6.1 The Problem with Quantum Philosophy 6.2 Matrix Mechanics (Fall 1925) 6.3 Wave Mechanics (Spring 1926) 6.4 Quantum Mechanics (Fall 1926) 6.5 Philosophies of Compromise (1927) 6.6 Discussion 7 Conclusions: The Precarious Copenhagen Network and the Forman Thesis Appendix A Visitors at Bohr’s Institute in Copenhagen (Chronological Order, up to 1927) Appendix B Information Concerning Fellowships in Science Awarded by the International Education Board (1925) Appendix C IEB: Excerpts from Applications and Correspondence Regarding Individual Fellows References Index