Traumatic brain injury, including concussions, occurs in sporting activities when the head is subjected to sudden high magnitude acceleration caused by a hit. As reports of head injuries for contact sports increase, sports personnel need useful information about what’s happening to players at the first sign of a hit. i1 Biometrics is prioritizing research and development efforts in areas surrounding both linear and rotational acceleration. Linear acceleration occurs when the head experiences a change in speed while moving in a straight line. For example, when an outfielder collides with the outfield wall while tracking a deep fly ball. Rotational acceleration occurs when the head experiences a change in its rate of rotation, even if there is no straight-line motion. Since most collisions include components of both linear and rotational acceleration, we made it our goal to create a measurement system that could capture all the elements relevant to brain injury.