Cousin of Neville Chamberlain (British Prime Minister, 1937-1940).
Father of Jennifer Nichols.
He was initially reluctant to sign on to play Batman's butler, Alfred Pennyworth, on "Batman" (1966) until a friend pointed out to him that the show would make him the most famous butler in the world.
Immigrated to the United States on 28 April 1939.
In Tim Burton's Batman (1989) the Joker's alter ego is named Jack Napier, in Alan's honor.
Maternal step-grandfather of actor Brian Forster.