This issue of the IBM Journal of Research and Development contains papers honoring the life and career of IBM Fellow Charles H. Bennett on the occasion of his sixtieth birthday. Most of the papers are based on talks presented at a symposium held at the IBM Thomas J. Watson Research Center in Yorktown Heights, New York, on May 8 and 9, 2003. Nearly one hundred participants, some from far distant points on the globe, contributed to the lively discussions and celebrations at that symposium. The papers reflect the active intellectual atmosphere that prevailed at the symposium and show the wide range of Charlie's seminal contributions to several areas of fundamental science. Some of the authors have dug deep into their archives and unearthed photographic and other mementos of their interactions with Charlie, which the reader will find throughout the issue.
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