A new article in the Journal of Policy Analysis and Management reviews the book, Fighting for Reliable Evidence by Judith Gueron and Howard Rolston (2013). This is an incredibly powerful book, full of information that graduate schools do not teach and that would take a lifetime to learn on the job. Readers shadow the narrators—Judith Gueron, one of the founding employees and now President Emeritus of MDRC, and Howard Rolston, a long-time senior civil servant in the U.S. Department of Health and Human Services (HHS)—as they share their intersecting professional journeys in service of improving the welfare of our nation and its people. This book exposed the debt those of us in the policy and evaluation communities owe to that band of warriors within the organization who stayed focused on their mission of generating and using evidence to improve the lives of people. This meant continually improving the science and craft of field experiments as new opportunities and challenges emerged. This book deserves a place on the required readings list for students of policy analysis, public administration, applied social sciences, and organizational leadership. It also is a must-read for thought leaders and practitioners who are intent on channeling scarce resources to achieve the greatest good.