Mark Siegel (born June 2, 1967 in Ann Arbor, Michigan) is known both as an author, illustrator, and as the editorial director of First Second Books, a Macmillan imprint which publishes graphic novels for all ages. His books in print to date are Seadogs, An Epic Ocean Operetta (on a script by children's author Lisa Wheeler), Long Night Moon (on a script by author Cynthia Rylant), To Dance, A Ballerina's Graphic Novel (on a script by his wife Siena Cherson Siegel), Moving House, his first picture book as author and illustrator. He also illustrated Oskar and the Eight Blessings (on a script by Tanya and Richard Simon), winner of the 2015 National Jewish Book Award; and How to Read a Story (on a script by Kate Messner.) Siegel is the author of the graphic novel for adults Sailor Twain, or the Mermaid in the Hudson (2012), which was serialized online starting in 2010, a New York Times Bestseller. In 2017, he launched the 5 Worlds graphic novel series, a five-volume science fiction story co-written with his brother Alexis Siegel, and illustrated with Matt Rockefeller, Xanthe Bouma, and Boya Sun. Book one is The Sand Warrior (2017). Book two is The Cobalt Prince (2018). Under the banner of First Second Books, located in the Flatiron Building in New York City, Siegel is the editor of works by authors and artists such as Ben Hatke, Gene Luen Yang, Jillian Tamaki, Paul Pope, Lewis Trondheim, Jane Yolen, and Adam Rapp. In 2006, First Second published American Born Chinese by Gene Luen Yang, the first graphic novel ever nominated for a National Book Award, and the first ever to win the American Library Association's Edward L. Printz Award. In 2015, First Second published This One Summer by the cousins Jillian and Mariko Tamaki, the first book in any format ever nominated as a finalist for both the American Library Association's Randolph Caldecott Award, and the American Library Association's Edward L. Printz Award. Siegel has given lectures and workshops around North America, for authors, artists, librarians, students, executives in many venues, at trade shows, companies, Comic Cons, and animation studios, including Blue Sky, Dreamworks, Disney, and Pixar.