Michel Henon, a playfull and simplifying mind
  Several chapters in this book present various aspects of Michel Henon's scientific acheivements that spread over a large range of subjects, and yet managed to make deep contributions to most of them. The authors of these chapters make a much better job at demonstrating the big advancements that Michel Henon allowed in these fields than I could ever do. Here I rather present some facets of his personnality that most appealed to me. Michel Henon was a reserved person, almost shy, so it was not obvious for a young student to grasp the profoundness of his insight and what a marvelous advisor he could be. The two most prominent aspects of his mind, in my view, were his ability to simplify any scientific question to its core complexity, and to find the fun and amusing part in his everyday work, even in the tiniest details of his scientific investigations. 
Jean-Marc Petit (Institut UTINAM - CNRS, Besancon)
astro-ph.GA