Jeffrey A. Segal, Harold J. Spaeth

Jeffrey A. Segal and Harold J. Spaeth are political scientists who developed the attitudinal model of judicial decision-making. Their research argues that Supreme Court justices base their votes primarily on personal policy preferences rather than legal principles or precedent. Segal holds positions at Stony Brook University, where he teaches political science and serves in administrative roles. Spaeth was a professor at Michigan State University until his retirement and death in 2020. Their collaborative work spans decades and focuses on empirical analysis of Supreme Court voting patterns. They use statistical methods to demonstrate correlations between justices' ideological positions and their case votes. The attitudinal model challenges traditional legal scholarship that emphasizes the role of law and precedent in judicial decisions. Their theory positions Supreme Court justices as policy-makers who pursue their preferred outcomes within institutional constraints.

Readers appreciate the empirical rigor and statistical analysis that Segal and Spaeth bring to judicial studies. Many find their data-driven approach convincing and note that the authors support their arguments with extensive quantitative evidence. Legal scholars and political science students praise the books for challenging conventional wisdom about how justices make decisions. The mathematical and statistical content proves difficult for some readers without backgrounds in quantitative methods. Several reviewers mention struggling with the technical aspects of the regression analyses and statistical models presented throughout the books. Some critics argue that the attitudinal model oversimplifies judicial decision-making by reducing complex legal reasoning to ideological preferences. Legal practitioners and some scholars contend that the authors underestimate the influence of legal doctrine and precedent on judicial outcomes. Readers note that the writing style can be dry and academic, making the books challenging for general audiences despite their significant contributions to understanding the Supreme Court.

The Supreme Court and the Attitudinal Model, The Supreme Court and the Attitudinal Model Revisited