Served as a stunt double for Patrick McGoohan on his various series -- "Danger Man," "Secret Agent" and "The Prisoner".
Made his film debut as an extra in the historical drama Caesar and Cleopatra (1945) upon the leaving the hospital following his recovery from wounds suffered in the war.
Served in the Army Parachute Regiment during WWII. Was wounded in action.
He was a medal-winning boxer in school.
Maher co-wrote three action novels with Denis Cleary: The Capricorn Run (also known as The Hook), Sahara Strike and Wipe Out! They were published in the late 1970s and early 1980s.
He scripted action sequences for both Die Hard (1988) and Die Hard 2 (1990).