Galt Rutherford Pierce is the son of J. Rutherford Pierce and Debi Ann Pierce, and is the brother of Cara Pierce. He is an Ekaterina through his mother, Debi Ann Pierce, neé Deborah Starling. He is an antagonist of Unstoppable.
He is seen playing tennis with his coach on the island. Later in the book he parachutes into Ireland with Cara. He starts to take the Janus Serum instead of the Tomas Serum after Cara switches the "protein shakes."
He and Cara interrogate Dan. Galt wants to beat Dan up, but is restrained by his sister. Galt is enraged after finding out Cara is her father's favorite. He, Pierce, and Galt's pilot try to stop Jonah Wizard's plane from landing in the Siem Reap airport. He is tracking the Cahills all across Cambodia. During the All-American Clambake, Galt is shown greeting guests. He is later defeated after possibly trying to kill Jonah by making Pierce look bad in front of the whole world.