This essay examines the intellectual history of the idea of judicial restraint, starting with the early debates among the US Constitution’s founding generation. In the late nineteenth century, law professor James Bradley Thayer championed the concept and passed it on to his students and others, including Oliver Wendell Holmes Jr., Learned Hand, Louis Brandeis, and Felix Frankfurter, who modified and applied it based on the jurisprudential preoccupations of a different era. In a masterful account, Brad Snyder examines Justice Frankfurter’s attempt to put the idea into practice. Although Frankfurter arguably made a mess of it, he passed the idea of judicial restraint on to Alexander Bickel and others. Today it remains a topic of much academic...