Ben Waters is played by actor Atticus Todd (via IMDb). In November 2020, Todd sat down with the Emmys for an interview with the Emmys in honor of Native American Heritage Month (via the Emmys). Todd got his start in Minnesota of all places, where he studied martial arts. He booked his first gig when a casting director came into his studio, asked for "big guys who could move," and Todd promptly did a cartwheel on the spot and got hired for a McDonald's commercial.
In his interview, Todd called Ben Waters a "highlight" of his career. "Captain Waters is completely loyal to Chief Rainwater, and his primary concern is the reservation," he explained. "All else is secondary to the health and safety of the reservation. He's done stuff that may not be completely legal. Even he sometimes functions in the gray."
Other than "Yellowstone," Todd has appeared on shows like "The Shield," "ER," "Malcolm in the Middle," "Nip/Tuck," "The Mentalist," "Law & Order: Los Angeles," "Big Love," "Bosch," "Criminal Minds," "It's Always Sunny in Philadelphia," "Hawaii Five-0," "Stumptown," and "Agent Carter."