David Keith McCallum Jr. (born 19 September 1933) is a Scottish actor and musician. He is best known for his roles as Illya Kuryakin, a Russian secret agent, in the television series The Man From U.N.C.L.E. (1964–68), as interdimensional operative Steel in Sapphire & Steel, and for his current role as NCIS medical examiner Dr. Donald “Ducky” Mallard in the American television series NCIS.
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David Keith McCallum Jr. (born 19 September 1933) is a Scottish actor and musician. He is best known for his roles as Illya Kuryakin, a Russian secret agent, in the television series The Man From U.N.C.L.E. (1964–68), as interdimensional operative Steel in Sapphire & Steel, and for his current role as NCIS medical examiner Dr. Donald “Ducky” Mallard in the American television series NCIS.