This book began as my dissertation research at the John F. Kennedy School of Government at Harvard University and ended during my first year of teaching at the School of Social Service Administration at the University of Chicago. At the Kennedy School, I was fortunate to have an intellectual community that saw this project through its many stages of development. I owe my greatest thanks to Mary Jo Bane who, as my dissertation advisor and mentor, provided support and guidance in more ways than I could describe. I am equally indebted to David Ellwood for his advising and support. In the end, much of what I have learned as a researcher, teacher, and professional I owe to their guidance and example. I hope that I can give my students but a portion of the many gifts they have given me.
I would like to thank the graduate students and members of the faculty and staff of the Malcolm Wiener Center for Social Policy who supported this project and contributed comments and criticisms during numerous luncheon seminars and individual consultations. In particular, Paul Jargowsky, Marie Chevrier, and Naomi Goldstein, my fellow graduate students, provided feedback on my work and invaluable technical and substantive expertise, along with their always available friendship. I would also like to thank David Wise and Richard Freeman who served as members of my committee and offered helpful suggestions and comments.
During my time at the Kennedy School, I had the opportunity to meet and benefit from the many talents of Richard Weissbourd. Rick's contributions to this work are many. His qualitative research and our conversations regarding this study and the substantive problems facing at