John's career within sport has been relatively varied, having experienced life as an international competitor, coach, sports scientist and strength and conditioning specialist.

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John is currently a senior lecturer in human performance at the University of Central Lancashire and consultant sports performance specialist to many teams and organisations. 

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John is the former head of performance at British Athletics, acted as the strength and conditioning coach for the Irish National Rugby Team for the winning 2015 six nations campaign and also the 2015 world cup. Most recently John was the S&C/ return to play coach for the Egyptian national team at the 2018 Fifa World Cup. 

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Outside the sporting domain John has consulted for both the police and the military and has performance managed the science and conditioning support for elite polar expeditions.

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From an academic perspective John graduated with an honours degree in sports science from the University of Limerick, and a master's degree in strength and conditioning from the University of Edinburgh. In the past John has lectured on sports science and physical education courses at the University of Limerick, has published in both practical coaching and peer-reviewed science journals, served as an invited reviewer for top sport science periodicals, authored a book chapter, presented on various topics at international sports science conferences, and regularly present at coaching conventions.