We would like to express our gratitude to a number of people for their encouragement, comments, and support. First, we thank the seven artists and the one former art dealer and exhibition organizer who permitted their interviews to be published in this volume: Robert Barry, Douglas Huebler, Stephen Kaltenbach, Sol Lefiitt, Robert Morris, Dennis Oppenheim, Seth Siegelaub, and Lawrence Weiner. Nancy Holt granted us permission to publish photographs by Robert Smithson and the interview with him; Darcy Huebler offered her assistance following the death of Douglas Huebler in the fall of 1997; and Duane Michals, Alice Zimmerman Weiner, and Kim Bush of the Solomon R. Guggenheim Museum archives all helped us obtain permission to reproduce illustrations for this project. Elizabeth Hess and Elizabeth Weatherford provided editorial support. Jessica May, Lora Rempel, and Alan Wright gave us invaluable assistance in preparing the manuscript, as did Ellie Hickerson of the University of California Press. We also profited a great deal from the anonymous readers who reviewed the manuscript for the Press. The College of Fine Arts at the University of Florida generously supported the initial work on this book. Finally, without the support and aid of our editors, Edward Dimendberg and Stephanie Fay, this book would not have been possible.