|Mariette was born in Weston, Connecticut, and began her career as a 13 year-old in the White Barn Theatre in Norwalk, Connecticut. After High School she was an active member of the school's theater group, and worked at the American Shakespeare Festival.
Her film career began with an uncredited cameo appearance in From Hell to Texas (1958), a western with Dennis Hopper. In the early 1960s, she moved to Los Angeles and joined the UCLA Theater Group. Later, she got her first movie, Ride the High Country (1962) with Joel McCrea, which earned her a BAFTA nomination.
In addition to her many other film roles, she also worked in the film TheMagnificent Seven Ride (1972). She has appeared on many western television series, such as: Gunsmoke, Bonanza, Cimarron Strip, The Virginian, The Travels of Jaimie McPheeters, and The Legend of Jessie James, as well as many other non-western TV series. She continues to work in the theatre and has hosted the syndicateddocumentary, Wild About Animals (1995-2015).
She is also known, however, for her series of Polaroid commercials with James Garner. An article that ran in TV Guide, titled: "That woman is not James Garner's wife!" goes to show the amazing on-screen chemistry of these two stars.
“The Reel Cowboys believe, along with her many fans, that Mariette will work in movies in the near future. We, the Cowboys are truly honored to have this lovely lady here tonight to receive her well-deserved Silver Spur award.”