Daniel P. Mannix was an award-winning American author and journalist, as well as a magician and filmmaker. Mannix's magazine articles about his experiences in the carnival, where he performed under the stage name "The Great Zadma," became popular in the mid-1940s and were compiled with the assistance of his wife in the book Step Right Up! His dozens of books and extensive essays range in subject from children's animal stories, environmental issues, and hunting accounts to historical examinations of the Hellfire Club, the Atlantic slave trade, and the Roman gladiatorial games. Mannix was particularly interested in the Wizard of Oz canon and composed a biography of L. Frank Baum for American Heritage magazine in the 1960s.