Initially gained fame in the 1860s for his photographs of Yosemite Valley, published under the alias 'Helios,' but is now likely more famous for helping Leland Stanford—the governor of California—settle an argument regarding whether a racehorse ever has all four feet off the ground during a gallop. Muybridge eventually did this to the satisfaction of the public with a series of tripwire-triggered cameras; the series of photos thus created was later exhibited in the form of a zoopraxiscope, an early motion-picture device Muybridge also invented. Muybridge also shot and killed his wife's lover, Major Harry Larkyns. He was acquitted on the basis of justifiable homicide, and the trial was later dramatized in Philip Glass's opera The Photographer.