ms: Callum O' Brien (lahir 4 November 1982 di Cambridge, New Zealand) ialah seorang pemain skuasy profesional. Callum O'brien (lahir 4 November 1982 di Cambridge) ialah seorang pemain skuasy profesional New Zealand.
en: Callum O 'brien ( born November 4 , 1982 in Cambridge , New Zealand ) is a professional squash player . Callum O'brien ( born 4 November 1982 in Cambridge ) is a New Zealand professional squash player .