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.
During his run on "The Avengers" (1961), Macnee's only weapon was an umbrella sword; he was rarely if ever seen carrying or using a gun. Macnee has stated in interviews that he insisted on this, because he'd seen enough carnage in combat during his military service in World War II.
He has played the role of Algernon Moncrieff in three different television productions of Oscar Wilde's "The Importance of Being Earnest".
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 voice over work.
Macnee and Christopher Lee are the only two surviving cast members of Sir Laurence Olivier's Hamlet (1948).
Was expelled from Eton for bookmaking.