John Okallanghn
jaronrawlJohn Okallanghn
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John O'Callaghan has performed in Canada, Ireland and the USA. He left home at 17 to study Computer Science at the University of Ulster in Belfast. .
John O'Callaghan, Actor: Stargate: Atlantis. John O'Callaghan has performed in Canada, Ireland and the USA. He left home at 17 to study Computer Science at the .
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