Captain Simpson Markson was the captain of the civilian ship Argo Navis. He was selected to sit on the Judges Tribunial for the Baltar Trial (TRS: "The Son Also Rises").
Notes
He may be one of the two unnamed captains sitting either side of Captain Tarney, Captain Franks and Admiral Adama, and could be a member of the Quorum of Ships' Captains in Islanded in a Stream of Stars.