This volume was developed from a symposium dedicated to Jack McIntosh presented at the 2001 Society of Vertebrate Paleontology annual meeting, which we convered with Dan Chure. We thank Jack McIntosh for allowing us to organize a symposium in his honor. We also thank the participants of that symposium, most of whom authored chapters in this volume, for their excellent papers and patience throughout the process of bringing this book to publication. We especially thank Blake Edgar (UC Press) for initially supporting this project and his continual guidance throughout