From Wikipedia, the free encyclopedia Henry Wilson "Heck" Allen (September 12, 1912 – October 26, 1991) was an American author and screenwriter. He used several different pseudonyms for his works. His 50+ novels of the American West were published under the pen names Will Henry and Clay Fisher. Allen's screenplays and scripts for animated shorts were credited to Heck Allen and Henry Allen. In 1937 Allen began working as a contract screenwriter for MGM animation division. While his early work was for Harman and Ising's Barney Bear series, his longest collaboration was with director Tex Avery. Allen was credited as story artist on many classic Avery shorts, included Swing Shift Cinderella, King-Size Canary, and The First Bad Man, among many others. Allen downplayed his contributions to the shorts, claiming that Avery merely used him as a sounding board for his own ideas. Allen's career as a novelist began in 1952, with the publication of his first Western No Survivors. Allen, afraid that the studio would disapprove of his moonlighting, used a pen name to avoid trouble. He would go on to publish over 50 novels, eight of which were adapted for the screen. Most of these were published under one or the other of the pseudonyms Will Henry and Clay Fisher. Allen was a five-time winner of the Spur Award from the Western Writers of America and a recipient of the Levi Strauss Award for lifetime achievement.