Samuel Langhorne Clemens (pen name Mark Twain) (30 November 1835 – 21 April 1910) was an influential American writer, whose notable works include "The Adventures of Tom Sawyer" and "Adventures of Huckleberry Finn". Mike Sekowsky (19 November 1923 - 30 March 1989) mainly worked for Marvel and DC comics drawing characters such as Captain America and Wonder Woman. He co-created The Justice League of America and spent the last part of his career working on TV show Scooby-Doo. Frank Giacoia (6 July 1924 - 4 February 1988) was primarily an "inker" working for Marvel and DC Comics.