After graduating from the University of West Virginia, Shun worked in freelance translation/interpreting and voiceover for NHK Sports and CNN World Sports, covering major live sports such Major League baseball, American Football, and NBA basketball. He then worked as the interpreter for Bobby Valentine, manager of the Chiba Lotte Marines baseball team, and later as the interpreter for World Baseball Classic championship interviews, as well as official interpreter for the Nippon Professional Baseball All-Star series, and much more.