David Keith McCallum, Jr. (born 19 September 1933) is a Scottish actor and musician. He first gained recognition in the 1960s for playing Russian spy Illya Kuryakin, a Russian secret agent, in the television series The Man from U.N.C.L.E. and as interdimensional operative Steel in Sapphire & Steel.
In recent years, McCallum has gained international recognition and popularity for his role as NCIS medical examiner Dr. Donald "Ducky" Mallard in the American television series NCIS.
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Books:Once a Crooked Man, January 2017
Once a Crooked Man, January 2016