- 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).
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