Drawing on more than 25,000 party and amicus briefs filed between 1984 and 2015 and the text of the related court opinions, as well as interviews with former Supreme Court clerks and attorneys who have prepared and filed briefs before the Supreme Court, Morgan Hazelton and Rachael Hinkle have shed light on one of the more mysterious and consequential features of Supreme Court decision-making. offers new evidence that the resource advantage enjoyed by some parties likely stems from both the ability of their experienced attorneys to craft excellent briefs and their reputations with the justices. The analyses also reveal that information operates differently in terms of influencing who wins and what policy is announced. Using those original interviews and quantitative analyses of a rich original dataset of tens of thousands of briefs, with measures built using sophisticated natural language processing tools, Hazelton and Hinkle investigate the factors that influence what information litigants and their attorneys provide to the Supreme Court and what the justices and their clerks do with that information in deciding cases that set legal policy for the entire country.