Caleb Carr is an American author and historian, best known for his historical novels and works on criminal psychology. He gained fame with his debut novel, The Alienist, published in 1994, which explores the early days of criminal profiling in the late 19th century. Carr's writing often combines elements of history, psychology, and suspense. In addition to his fiction, Carr has written non-fiction works, including The Devil Soldier, which examines the life of a 19th-century American mercenary. He has also contributed to various publications and has been involved in discussions about historical and contemporary issues related to crime and society.