20th-century pseudonymous writers
Mark Twain
Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), known by the pen name Mark Twain, was an American writer, humorist, and essayist. He has been praised as the "greatest humorist the United States has produced", with William Faulkner calling him "the father of American literature".
Max Brand
Frederick Schiller Faust (May 29, 1892 – May 12, 1944) was an American writer known primarily for his Western stories using the pseudonym Max Brand. As Max Brand, he also created the popular fictional character of young medical intern Dr. James Kildare for a series of pulp fiction stories.