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 5 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". Sometimes known as visual writing, the typographical variation corresponds directly, at any given narratological point in time, to the physical space of the events in the fictional world as well as the physical space of the page and the reader. Early on, critics characterized his writing as being ergodic literature, and Danielewski has described his style as: