Donald Kagan was a distinguished historian and classicist, renowned for his expertise in ancient Greek history. Born in 1932 in Lithuania, he immigrated to the United States, eventually earning his Ph.D. from Ohio State University. Kagan's seminal work, a four-volume history of the Peloponnesian War, established him as a leading authority on ancient warfare and politics. He served as a professor at Yale University and was an influential educator and administrator. His commitment to liberal education and insightful analyses of ancient and modern political systems earned him widespread respect. Kagan passed away in 2021, leaving a lasting legacy in historical scholarship.