Greil Marcus is an American music journalist, author, and cultural critic known for his insightful analysis of popular music and its impact on culture. He gained prominence with his book, Mystery Train, which explores the significance of American music, particularly blues and rock, in shaping national identity. Throughout his career, Marcus has contributed to various publications, including Rolling Stone and The Village Voice. His work often examines the connections between music, history, and social issues, making him a key figure in the field of music criticism. His unique perspective has influenced both fans and scholars alike.