George R. Clark served in various capacities as an instructor, navigator, line officer, station commandant, and retired as Judge Advocate General of the Navy in the late 19th and early 20th centuries.

[1] After graduation in 1878, he served successively until the fall of 1889, in the following ships of the US Navy: Independence, Tuscarora, Wachusett, Michigan, Trenton, Alliance, and Lancaster.

[1] He commanded the battleship Texas from September 1906 until August 1907, when he returned to the Naval Academy to serve as Head of the Department of English.

[1] In May 1918, during World War I, Rear Admiral Clark returned to the United States for duty as Judge Advocate General of the Navy.

[1] Rear Admiral Clark, in collaboration with others, wrote a Short History of the United States Navy, which was published in 1911, and subsequently used as a text book at the Naval Academy.