Adriana Villavicencio’s new book, Am I My Brother’s Keeper?, offers powerful insights into the challenges of implementing large-scale educational change. Drawing on the Research Alliance’s four-year study of the Expanded Success Initiative (ESI), which aimed to improve the educational outcomes of 15,000 Black and Latinx males in NYC public high schools, the book examines what worked, what didn’t, and what we can learn from the experience.