Working Life is a monthly column in which Texans talk about their jobs. Tommy Johnson, who is 43, is a Division I men’s basketball referee from Murphy, in North Texas. Last year he worked his first March Madness.My parents were in the military. I moved all over and graduated from high school in Oklahoma City. I played college ball at Missouri State, then overseas in Europe. When I got back, my parents had retired to the Dallas–Fort Worth area, and now I live nearby with my wife and son.Almost every ref has a day job. For six and a half years, mine was being a police officer. Honestly, it made me a better ref. As a cop, I was dealing with everything; basketball’s easier than that.…