Several people have supported me in this project. Most of all I want to thank my two research assistants, Lilliana (Yanan) Li and Kathryn Jackson, whose steadfast support, diligent and careful work, and generous spirit have been invaluable to this project. Colleagues have also supported me. First is Richard Harris, who read through innumerable drafts and was always happy to engage with me in thoughtful discussions that pressed me to clarify my ideas. I am also always and forever indebted to Steven K. Vogel and Beverly Crawford who have been mentors to me. They both kindly waded through a lengthy draft to give me incisive feedback. Among my fellow faculty, Lorraine Minette and John Wall generously read through some of the earlier formulations of my typologies and provided probing questions that helped me strengthen my arguments. Senior colleagues, Paul Jarkowsky and Marie Chevrier, have always been there for me to answer questions and guide me when needed. Although across a vast ocean, Catherine Boone has continued to be an inspiration and to believe in my endeavors, even though they have migrated far away from hers. Finally, I want to thank my editor, Angela Chnapko, who believed in this project from the beginning and has been supportive throughout.