Henry Louis Hasse (1913–1977) was an American science fiction author and active member of early science fiction fandom. Emerging during the pulp era of the 1930s and 1940s, Hasse contributed several notable stories to the genre's formative years. He is particularly remembered for his collaborative relationship with a young Ray Bradbury, helping to launch the legendary author's professional career.
Hasse co-authored Bradbury's very first professionally published story, "Pendulum," which made its debut in the November 1941 issue of Super Science Stories. The duo continued their creative partnership with two subsequent published works: "Gabriel's Horn" in 1943 and "Final Victim" in 1946. These early collaborations remain a significant milestone in science fiction history, marking the transition of Bradbury from fan to professional writer.
Beyond his work with Bradbury, Hasse achieved individual recognition for his solo writing. His most celebrated work is the novelette "He Who Shrank," a classic tale of microscopic exploration and cosmic scale. The story has been widely anthologized, appearing in Raymond J. Healy and J. Francis McComas's landmark 1946 collection Adventures in Time and Space, as well as Isaac Asimov's retrospective anthology Before the Golden Age, cementing Hasse's place in the annals of early American science fiction.
