- John is the eldest of 5 children, he was educated at St. Colman's College, Newry, and Central School of Speech and Drama, London.
- John has a sister, Susan Lynch, who is an established actress in London. Along with appearing in The Secret of Roan Inish (1994) she was also in Interview with the Vampire: The Vampire Chronicles (1994) and an episode of the British crime series Cracker (1993).
- He used to be a member of the RSC playing roles such as Smike in Nicholas Nickelby and roles in films such as Cal, The Railway Station Man and Derek Jarman's Edward II.
- He was originally listed for the film Robinson Crusoe which was due for filming in 1987.
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