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.

Biography

McCallum was first married to actress Jill Ireland on 11 May 1957 in London. In 1963 he introduced Ireland to Charles Bronson when both were filming The Great Escape. She subsequently left McCallum and married Bronson in 1968. McCallum and Ireland had three sons: Paul, Jason (an adopted son who died from an accidental drug overdose in 1989), and Val (short for Valentine). Val McCallum is a successful guitar player, playing with Jackson Browne most recently in 2014 and currently a member of the faux country band Jackshit.

He has been married to Katherine Carpenter since 1967. They have a son, Peter, and a daughter, Sophie. McCallum and his wife are active with charitable organizations that support the United States Marine Corps: Katherine's father was a Marine who served in the Battle of Iwo Jima, and her brother lost his life in the Vietnam War.

McCallum has six grandchildren.