When I first read the late Fr. John O’Malley’s survey text What Happened at Vatican II (2008), I was struck by a passage in the conclusion. O’Malley gave a tantalizing rundown of the “ghosts” present on the council floor—the popes, theologians, philosophers, and politicians whose lives and legacies had indelibly marked the Catholic world. These voices from the past had shaped, positively or negatively (sometimes both), the work of the council fathers: