Mason is the eldest of the Tarver Bros. and has the highest IQ far surpassing Zach or Cody's. Him being the older brother of Zach and Cody he has to take care of them for they are too weak to sustain themselves.
Mason is a tricky one, being the younger brother of Tyler means he did inherit his brains. Although he isn't as smart as him he still is in a league of his own. Mason has shown amazing leadership skills in leading his two younger brothers, he has succesfully heisted many banks, and has even stolen all of the gold from Fort Knox . If you see Mason in person then your wallet has already been stolen.