Andrew "Jack" Gaylor (1846-1921)
Andrew "Jack" Gaylor (1846-1921)
Wyoming Ancestor Yosemite Ranger
"First Rangers" of Yosemite National Park 
 
From John Bingaman's "Guardians of the Yosemite" (Chief Ranger Forest Townsley, far left; Asst Chief Ranger Jack Gaylor 3d from left) There are several other mounted formations I found online but with less clarity