Editors' note: This story was originally published on June 1, 2017.10. He's an actorYou might have seen the Dallas Mavericks owner in Sharknado 3 as the President of the United States. That wasn't his acting debut by any means. He's been in the TV series "Entourage," "The League," and he was even in two episodes of "Walker, Texas Ranger."He's also been featured on "The Simpsons."9.