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Peter used the stage name Graves, a maternal family name. He used the name Graves to honor his mother's family, and also so as to not be confused with his older brother, James Arness, who was a famous actor in his own right, as the star of the television series Gunsmoke.
Feldman introduced Arness to Wayne, who put the self-described 6' 6 actor under personal contract. Arness played several roles over the next few years for and with Wayne, whom he considered a mentor. In 1955, Wayne recommended Arness for the lead role of Matt Dillon in the TV series Gunsmoke (1955).