James B. McPherson is a prominent American historian known for his work on the American Civil War. Born on October 11, 1936, he has authored several influential books, including the Pulitzer Prize-winning "Battle Cry of Freedom," which provides a comprehensive overview of the Civil War and its causes. McPherson has served as a professor at Princeton University and has been involved with various historical organizations. His research focuses on the political, social, and military aspects of the Civil War, making significant contributions to the understanding of this pivotal period in American history.