Carr is author of the novels The Alienist, The Angel of Darkness, Casing the Promised Land, Killing Time, The Italian Secretary, and the nonfiction books The Devil Soldier, a biography of 19-century American mercenary Frederick Townsend Ward, and The Lessons of Terror. Many of his novels are set in Victorian times; The Italian Secretary was an authorized Sherlock Holmes mystery.
Carr has written plays and movie screenplays, one of which, Bad Attitudes was made into a TV movie in 1991. He was one of the contributing screenwriters for the film prequel to The Exorcist, released as Dominion: Prequel to the Exorcist, for which he received a shared story credit. He also received a shared screenplay credit on Exorcist: The Beginning. In television, he appears on the PBS program American Experience as a guest commentator/narrator, such as on the episode of the NYC subway system, "New York Underground".
Carr taught three semesters of military history at Bard College as a Visiting Professor. He was also a close friend and confidant of historian James Chace, with whom he collaborated on America Invulnerable: The Quest for Absolute Security from 1812 to Star Wars. He currently resides in upstate New York on a farm estate called "Misery Mountain" in the town of Berlin, New York in Rensselaer County. Carr ran as a Democrat for the Rensselaer County Legislature in 2005 but came in 4th of 4 candidates.
Link, Alex. "City Limits: Fixing New York in Caleb Carr's The Alienist." CLUES: A Journal of Detection 23.3 (Spring 2005): 31-41.