in 1991.   under 3 months [270] Charles Sheffield 1935–2002 Mathematician, physicist and science fiction writer.   3 months [271] Mary Shelley 1797–1851 Author of Frankenstein , wife of Percy Bysshe Shelley .     [272] Lou Stathis 1952–1997 A writer, editor and critic.   10 months [273] Trumbull Stickney 1874–1904