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-born secret agent, in the 1960s television series The Man from U.N.C.L.E., as interdimensional operative Steel in Sapphire & Steel, and Dr. Donald "Ducky" Mallard in the series NCIS.
McCallum was born in Glasgow, the second of two sons of Dorothy Dorman, a cellist, and orchestral leader David McCallum, Sr. When he was 10, his family moved to London. Involved in local amateur drama, aged 17 he appeared as Oberon in an open-air production of A Midsummer Night's Dream with the Play and Pageant Union.
McCallum won a scholarship to University College School, a boys' independent school in Hampstead, London, followed by the Royal Academy of Dramatic Art (also in London).
McCallum became Assistant Stage Manager of the Glyndebourne Opera Company in 1951.
In 1951 he did his National Service where he was commissioned into the Middlesex Regiment and seconded to the Gold Coast Regiment.
He began his acting career doing boy voices for BBC Radio in 1947 and began taking bit-parts in British films from the late 1950s, and his first acting role was in Whom
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