Has played the role of Algernon Moncrieff in three different television productions of Oscar Wilde's "The Importance of Being Earnest".
Best known by the public for his starring role as Secret Agent John Steed on The Avengers (1961).
Became a United States citizen in 1959. In addition to his acting career, Macnee worked as a television producer in Britain, the United States and Canada. He is considered to be one of the pioneers of Canadian television.
He was born to a wealthy and extraordinarily eccentric family. As his father (Daniel Macnee), a race horse trainer, drank and gambled the family's money away, his mother (Dorothea Mary Henry) took young Patrick to live with her lover, Evelyn, in a huge mansion in southern England, where he wore kilts until the age of 11.
He was forced to retire from acting due to problems with arthritis, but can still do voiceover work.