In June 2015, John Roberts finished his tenth year as Chief Justice of the United States. In the years since he joined the Supreme Court, Chief Justice Roberts has had the opportunity to define himself as a Justice—through the votes he has cast, the decisions he has written, and the manner in which he has led the Supreme Court and the federal judiciary. The first ten years of John Roberts’s tenure as Chief Justice saw many significant cases, from same-sex marriage to abortion to affirmative action. By looking at what the Chief Justice has done a decade in, we hope to be able to offer some fresh insights into whether Chief Justice Roberts has lived up to the promises made by Judge John Roberts at his confirmation hearings.