Mario Cooper was an illustrator. He illustrated several of Agatha Christie's stories when they were first published in Collier's Weekly in the 1930s and 40s.
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- 1937, 28 August (Volume 100, Number 9) to 23 October (Volume 100, Number 17) - Appointment with Death.
- 1938, 12 November 1938 (Volume 102, Number 20) to 14 January 1939 (Volume 103, Number 2) - Hercule Poirot's Christmas, under the title Murder For Christmas.
- 1939, 25 November 1939 (Volume 104, Number 22) to 27 January 1940 (Volume 105, Number 4) - Sad Cypress.
- 1940, August 3 (Volume 106, Number 5) to September 28 (Volume 106, Number 13) - One, Two, Buckle My Shoe, under the title The Patriotic Murders.
- 1940, 9 November 1940 (Vol. 106, Number 19) - Four and Twenty Blackbirds.
- 1940, 14 December 1940 (Volume 106, Number 24) to 22 February 1941 (Volume 107, Number 8) - Evil Under the Sun.
- 1941, 20 September (Volume 108, Number 12) to 22 November 1941 (Volume 108, Number 21) - Five Little Pigs, under the title Murder in Retrospect.
- 1942, 28 March (Volume 109, Number 13) to 16 May (Volume 109, Number 20) - The Moving Finger.
- 1946, 4 May (Volume 117, Number 18) and 25 May (Volume 117, Number 21) - The Hollow, under the title of The Outraged Heart.