Chris Nowinski is a neuroscientist specialising in concussions and the world's leading advocate of the dangers of repetitive hits to the head in sports.
The US neuroscientist and former professional wrestler has been at the forefront of research into CTE in the NFL and other sports.
One of Nowinski's goals is to get more athletes from around the world to commit to donating their brain for research and end the head trauma caused by contact sports.
Chris is also the co-founder and CEO of the Concussion Legacy Foundation, a non-profit organisation leading the fight against concussions and CTE and dedicated to improving the lives of those impacted.
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Straight Talk with Mark Bouris