Kevin Guskiewicz is one of the leading concussion experts in the world, Kenan Distinguished Professor, Director of the Center for the Study of Retired Athletes, and Co-Director of the Matthew Gfeller Sport-Related Traumatic Brain Injury Research Center at UNC. Guskiewicz tells WCHL’s Blake Hodge the latest information on Ryan Hoffman, what work is done at UNC with former athletes, and how research is changing the landscape of sports.