Marco Ferdinand William Vasquez-d'Acugno Vassi (New York City, November 6, 1937 – New York City, January 14, 1989) was an American experimental thinker and author, most noted for his erotica. He wrote fiction and nonfiction, publishing hundreds of short stories, articles, and more than a dozen novels. Many of his works appeared as "Anonymous" in their first printings. He is most often compared to Henry Miller, has been called the greatest erotic writer of his time and "foremost of his generation," and praised by the likes of Norman Mailer, Gore Vidal, Saul Bellow, and Kate Millett.