Alan Deardorff was 65 years old on June 6, 2009. To celebrate this occasion, a Festschrift in his honor was held on October 2-3, 2009, in the Rackham Amphitheater at the University of Michigan. This title includes reprints of many of Professor Deardorff's most important papers that underlie the reflections on his work by the Festschrift panelists. ukryj opis