- Biography in: "The Scribner Encyclopedia of American Lives". Volume One, 1981-1985, pages 157-160. New York: Charles Scribner's Sons, 1998.
- Grandfather of Doran Clark and Louise Caire Clark.
- Father-in-law of Audrey Caire.
- Commanded 5th US Army (1943-1944) and Allied 15th Army Group (1944-1945) in Second World War (Mediterranean Theater of Operations).
- Clark's conduct of operations in the Italian Campaign remains controversial, particularly during the actions around the German Winter Line. His choice to take the undefended Italian capital of Rome in June 1944, rather than focusing on the destruction of the German 10th Army, has been heavily condemned.
- His mother was a Romanian Jew.
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