Major Zach Colson is a Terran Confederation pilot. He is also a jazz musician, and taught himself piano. Colson had joined the Society of the Mandarins, a rogue group of humans that working for the Kilrathi. He then began a campaign of betrayal and murder. Colson would sabotage ships, commit several murders, transmit classified information to the Kilrathi, and planted explosives on the Concordia's flight deck.