- "S.H.I.E.L.D.? Right. What's this all about?"
"We'd like to ask you a few questions, take a look around" - ―Baker and Phil Coulson[src]
Baker works at the Wrigley Fire Department. He was present when Coulson and his team arrived to investigate the mysterious deaths of two other firefighters from the same department, Adam Cross and Frank Whalen.
Trivia
Baker can be seen wearing a "mourning badge" (the black band over his badge). First responders wear these bands between the time of a fellow first responder's death and that person's funneral. In this case, the mourning badge is being worn for Adam Cross.