|Occupation||Military Police officer|
|First Appearance||Blowing the Whistle|
Mathewson is first seen when he is leading Brant's detail through the airport and Brant's brother Hayes stops him to see what is going on.
After Brant is hospitalized, he refuses treatment unless he is allowed to hold a press conference. Mathewson refuses, but agrees to allow Brant access to his father's personnel file.