Trevor Bannister was native of the planet Montana and an officer of the Montana Marshals Service.
He was the younger brother of Suzanne Bannister, and thus brother-in-law of Bernardus Van Dort. When his sister and his nieces disappeared aboard a Van Dort Line freighter, Trevor blamed Bernardus for their presumed deaths.
In 1921 PD, he held the office of Chief Marshal. (SI1)