Henry Walton Grinnell.

About Henry Walton Grinnell

Henry Walton Grinnell was an American naval officer who served in the American Civil War and Spanish–American War. He was Inspector General of the Imperial Japanese Navy from 1868 to 1870, retaining the rank of rear admiral through victory in the First Sino-Japanese War. Working in tandem with other foreign experts, Grinnell was credited with modernizing the Japanese navy in the late 19th century.