Mary Cosby is an American reality TV star best known for her role on Bravo’s The Real Housewives of Salt Lake City (RHOSLC).
She’s also the First Lady of Faith Temple Pentecostal Church in Salt Lake City, which she leads alongside her husband, Robert Cosby Sr.
BackgroundBorn Mary Martha Jefferson on October 17, 1972, she married Robert Sr.—her late grandmother Rosemary’s husband and her step-grandfather—in 1998, shortly after her grandmother’s death.
This union sparked family disputes over assets like businesses and properties, leading to estrangement from her mother Rosalind Cazares, who died in January 2025.