Agent Thompson is a high-ranking agent and a very old guy in the mysterious organization known as The Adjustment Bureau. He appears to oversee the "fate adjustments" of the other, lower-ranking agents, and is shown studying the "fate plan" of David Norris' life.
When Thompson was last "in the field his nickname was the hammer." The hammer likely refers to (Charles Martel (Latin: Carolus Martellus) (c. 688 – 22 October 741), literally Charles the Hammer, was a Frankish military and political leader." He is credited with organizing the beginning of the Middle Ages. During his opening sililoquey, Agent Thompson even mentions the Adjustment Bureau's intervention at the end of the Dark Ages (5th to 10th century), saying, "You gave us the Dark Ages in 5 centuries. Until finally we decided we should come back in."