Mark Z. Danielewski (born March 5, 1966) is an American author. He is the son of Polish avant-garde film director Tad Danielewski and the brother of singer and songwriter Annie Decatur Danielewski, a.k.a. Poe.

House of Leaves, Danielewski's first novel, has gained a considerable cult following. His second novel, Only Revolutions, was released in 2006. Though released to less critical acclaim than his debut, the novel was a finalist for the 2006 National Book Award. Danielewski's work is characterized by experimental choices in form, such as intricate and multi-layered narratives, typographical variation, and inconsistent page layouts.
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