Roger Browning is a former S.H.I.E.L.D. agent who after the S.H.I.E.L.D. Civil War started selling classified S.H.I.E.L.D. intel.
At some point in his life, Roger Browning joined S.H.I.E.L.D. and eventaully became assigned to a containment facility that held various objects including an 0-8-4.
After the S.H.I.E.L.D. Civil War, he used his knowledge of classified information and began selling information to the highest bidder, no longer caring whether the bidder was S.H.I.E.L.D. or HYDRA.
He was approached by Isabel Hartley and Lance Hunter, who were working undercover for the new S.H.I.E.L.D. led by Phil Coulson, about information concerning an 0-8-4. During their meeting, they were attacked by Carl Creel who stole the file.