Elmer Keith

Elmer Merrifield Keith was an Idaho 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.

He was married to Loraine Randall. Elmer Keith was born in Missouri but was raised in Montana, Idaho, and eastern Oregon. In the 1930s and early 1940s, he had a ranch on the North Fork of the Salmon River near Salmon, Idaho. In the late 1940s, Elmer and Loraine left the ranch and moved into the town of Salmon.

Source: Wikipedia