Rob Wiethoff is an American actor best known for his critically acclaimed performance as John Marston, the lead character in Rockstar Games' Red Dead Redemption (2010) and Red Dead Redemption 2 (2018). His work on these titles earned him widespread recognition and accolades for bringing emotional depth, nuance, and humanity to one of the most iconic characters in video game history.

Wiethoff graduated from Indiana University Bloomington with a degree in general studies. After college, he moved to Los Angeles to pursue acting, working various jobs while auditioning for commercials and small film roles. In 2008, he was cast as the lead in a then-unnamed video game—an audition that would change his life and redefine storytelling in interactive media.