Tom Sheldon is a stereotypical Texan: he has a passion for barbecues; hickory chips and all things American. In one cutscene he makes Rico a margarita and is often seen with his characteristic RV, the Pocumtuck Nomad. He was born on the 4th of July 1949, in Abilene, Texas, USA. He is mentioned once by Rico to have a fondness for word games. He hates commies, but he calls Looch (in his own words a former commie) his friend.
He is Rico Rodriguez's former commanding officer, friend and mentor.
It was revealed in the Eden Callaghan tapes added in the Bavarium Sea Heist DLC that his full name is Thomas Sheldon. Previously he was always known as Tom Sheldon.