A. J. Finn is the pen name of Daniel Mallory, an American writer known for psychological thrillers. Born in 1979 in New York City, he studied English at Duke University and later earned a master’s degree from the University of Oxford. Before becoming a novelist, he worked as a book editor in both New York and London.

He rose to international fame with his debut novel The Woman in the Window (2018), which became a #1 New York Times bestseller and was adapted into a film. His second novel, End of Story (2024), further established him in the thriller genre. Finn’s work is known for its suspenseful plots, unreliable narrators, and influences from classic crime fiction and film noir.