Claude Cohen-Tannoudji is Professor of Atomic and Molecular Physics at the College de France in Paris and was honoured with the Nobel Prize for Physics in 1997 for his work on the development of methods to cool and trap atoms with laser light. He is also the co-author of three other books: Quantum Mechanics (1992), Photons and Atoms: Introduction to Quantum Electrodynamics (1989), and Atom-Photon Interactions: Basic Processes and Applications (1998).