A member of the TREXPO Advisory Board, Sgt. Robert "Bob" O'Brien Cleveland SWAT Ret. is the founder of the R.J. O'Brien Group Ltd., a law enforcement training and consulting service that advises and trains a number of local, state, and federal SWAT teams. O'Brien co-founded Cleveland's full-time SWAT team, and he served with that unit for 25 years. He is a former consultant to the National Tactical Officers Association and a former vice president of the Ohio Tactical Officers Association.
Sports violence has even been identified by some as a medical disorder called Intermittent Explosive Disorder—"the other IED." It may be fueled by unusually high amounts of testosterone and caused by "idiots acting like fools."