Elmer Keith, American gun designer and author (d. 1984)

Elmer Merrifield Keith (March 8, 1899 – February 12, 1984) was an American rancher, firearms enthusiast, and author. Keith was instrumental in the development of the first magnum revolver cartridge, the .357 Magnum, as well as the later .44 Magnum and .41 Magnum cartridges, credited by Roy G. Jinks as "the father of big bore handgunning."