The contributors, colleagues, and his many, many other friends take great pleasure in presenting this volume to Philippe Choquard on the happy occasion of his 65th birthday.
Philippe is known to all of us not only as a theoretical physicist, but also as a man with broad interests and talents, a man possessing a great joie de vivre combined with a deep sense of the human condition. His enthusiasm for research and for life is a constant stimulus to those around him and to his friends around the world.