Mark Z. Danielewski (; born March 5, 1966) is an American fiction author. He is most widely known for his debut novel House of Leaves (2000), which won the New York Public Library's Young Lions Fiction Award. His second novel, Only Revolutions (2006), was nominated for the National Book Award. Danielewski began work on a 27-volume series, The Familiar, although he completed only five volumes before halting the project in 2017. Danielewski's work is characterized by an intricate, multi-layered typographical variation, or page layout, which he refers to as "signiconic".