During his Supreme Court nomination hearings, John Roberts idealized and mythologized the first judge he clerked for, Second Circuit Judge Henry Friendly, as the sophisticated judge-as-umpire. Thus far on the Court, Roberts has found it difficult to live up to his Friendly ideal, particularly in several high-profile cases. This Article addresses the influence of Friendly on Roberts and judges on law clerks by examining the roots of Roberts's distinguished yet unrecognized lineage of former clerks: Louis Brandeis 's clerkship with Horace Gray, Friendly's clerkship with Brandeis, and Roberts's clerkships with Friendly and Rehnquist. Labeling this lineage a judicial genealogy, this Article reorients clerkship scholarship away from clerks' influences on judges to judges' influences on clerks. It also shows how Brandeis, Friendly, and Roberts were influenced by their clerkship experiences and how they idealized their judges. By laying the clerkship experiences and career paths of Brandeis, Friendly, and Roberts side-byside in detailed primary source accounts, this Article argues that judicial influence on clerks is more professional than ideological and that the idealization ofjudges and emergence of clerks hips as must-have credentials contribute to a culture ofjudicial supremacy.