This volume is an outcome of an unlikely collaboration between people who, while unified by a common theme, are otherwise separated by disciplines, institutions, and geography. So our greatest thanks go to those who brought us together in 2015. They are Simon Goldhill of the University of Cambridge, Louise Braddock of the Independent Social Research Foundation (ISRF), and James Chandler of the University of Chicago. They sketched the initial intellectual vision and negotiated the funding and institutional support at those two universities. Equally important were the relationships we built and the admiration we developed for each other in our many intense conversations in Cambridge and California. At the University of California, Santa Barbara (UCSB), John Majewski, Dean of the Humanities and Fine Arts, supported the higher education branch of the collaboration until that group could obtain extramural funding. The National Endowment for the Humanities (NEH) Collaborative Research Program (grant RZ-255780-17) offered primary research support for two years; group research is usually done on a purely voluntary basis in the humanities and we are grateful to the NEH for funding one of the rare exceptions to the rule. Also crucial was another rare exception: the University of California Humanities Research Institute (HRI) provided a residential fellowship to an overlapping group of scholars, which allowed eleven weeks of uninterrupted debate and reflection across disciplines; we are grateful to director David Theo Goldberg and to the HRI staff, particularly Suedine Nakano and Arielle Reed, for their organizational support. We are also deeply grateful for the patient administrative work of Michelle Maciejewska of the Centre for Research in Arts, Social Sciences and Humanities (CRASSH) at Cambridge, Stuart Wilson of ISRF, and Tracey Goss and Marcelina Ortiz of the Chicano Studies Institute at UCSB. Many brilliant scholars of quantification participated in our workshops and conferences and otherwise provided intellectual inspiration. We are especially indebted to workshop participants and research colleagues Ted Porter, Mike Kelly, Havi Carel, Leah McClimans, Isabelle Bruno, Emmanuel Didier, and the late great Sally Engle Merry. Alan Thomas of the University of Chicago Press provided our volume proposal with a generous and insightful review. Ulrika Carlsson reviewed the entire volume for coherence and style with a remarkable rigor and speed, and made a major contribution to the volume’s consistency and clarity.