Martin Sensmeier (born June 27, 1985) (Tlingit/Koyukon-Athabascan) is an American actor and model. Of Alaska Native and European-American descent, he is known for playing various Native American roles. He starred in the 2016 remake The Magnificent Seven and had a recurring role as "Wanahton" in the HBO television series Westworld (2018) More recently, he has played a physical therapist in the TV series Yellowstone and a Comanche warrior named Sam in the prequel 1883 both directed by Taylor.