Pia Wurtzbach
$3 million
Mary Cosby has an estimated net worth of $5 million, derived from the family business empire she inherited from her grandmother and continued to develop alongside her husband Robert Cosby Sr. She is best known as an original cast member of The Real Housewives of Salt Lake City (Bravo) and as the First Lady of Faith Temple Pentecostal Church in Salt Lake City, Utah.
Updated March 2026: According to The Hollywood Reporter, filming on RHOSLC Season 7 was paused and then resumed without Mary Cosby in March 2026 following the death of her 23-year-old son, Robert Cosby Jr., on February 23, 2026. The cause of death has been reported as a possible overdose. The loss is the defining event of Cosby’s recent public life.
Mary Martha Cosby, née Jefferson, was born on October 17, 1972, in Utah. She was raised in a religious household with deep roots in the Pentecostal faith and grew up with the expectation that she would one day lead her grandmother’s church and business enterprises. Her grandmother, who built an extensive portfolio of businesses in the Salt Lake City area including a printing company, restaurants, and daycare centers, was the central figure in the family’s success. Mary attended local schools in Utah and grew up immersed in both faith community leadership and the family’s entrepreneurial operations.
Mary Cosby’s career path was shaped significantly by her grandmother’s legacy. When her grandmother died, she left the family businesses — including Faith Temple Pentecostal Church, a printing company, restaurants, and daycare centers — along with other assets to Mary, on the condition that she marry within the family’s extended business circle. In 1998, Mary married Robert Cosby Sr., who became her husband and business partner. Together they have managed and expanded the family portfolio, which includes real estate holdings across multiple states.
Mary became nationally prominent when she joined the original cast of The Real Housewives of Salt Lake City (RHOSLC) at its premiere in November 2020. The show, which profiles wealthy women in Salt Lake City’s affluent social circles, provided Cosby a platform that significantly elevated her public profile. She appeared intermittently in subsequent seasons, with her presence on the show reflecting the demands and complications of her personal and family life. Per early season reporting, cast members earned approximately $6,500 per episode in the first seasons, per Parade. Her church and businesses, including a renovated home described by Bravo as a 20,000-square-foot mansion, reopened in 2025 after extensive renovations.
Mary Cosby married Robert Cosby Sr. in 1998 as part of the terms of her grandmother’s inheritance — a condition she married Robert to satisfy, which became a much-discussed storyline on RHOSLC. The couple has one son, Robert Cosby Jr., who died on February 23, 2026, at age 23 in what has been reported as a possible overdose, per People. The loss prompted Bravo to pause filming of RHOSLC Season 7. Cosby’s primary residence is her 20,000-square-foot Salt Lake City mansion, currently undergoing renovation, with additional properties in several other cities.
Mary Cosby has an estimated net worth of approximately $5 million, primarily from the family business empire she inherited from her grandmother, including Faith Temple Pentecostal Church, a printing company, restaurants, daycare centers, and real estate across five states. Her RHOSLC cast fee and her husband’s business interests also contribute to the family’s total wealth.
Mary Cosby was born on October 17, 1972, in Utah, making her 53 years old as of March 2026. She joined RHOSLC at its premiere in November 2020 as an original cast member, becoming one of the show’s most distinctive personalities through her religious leadership role and her business background.
Mary Cosby stands 5 feet 4 inches tall. Known for her fashion-forward style on RHOSLC, she is frequently noted for her distinctive wardrobe choices on the show, which reflect both her religious identity and her affluent social standing.
Mary Cosby is married to Robert Cosby Sr., whom she wed in 1998. Their marriage was partly arranged to fulfill the terms of Mary’s grandmother’s inheritance — a requirement that she marry within the family’s business circle. Robert Sr. is a businessman who manages printing and other commercial ventures. The marriage and its unusual origin story were a prominent topic in the early seasons of RHOSLC, per Wikipedia.
Mary Cosby has one son, Robert Cosby Jr., who died on February 23, 2026, at age 23 in what has been reported as a possible overdose, per People. His death prompted Bravo to pause production of RHOSLC Season 7, per The Hollywood Reporter.
Mary Cosby’s primary residence is a 20,000-square-foot mansion in Salt Lake City, Utah, which underwent extensive renovations and reopened in 2025, per Bravo. She also maintains properties in New York City, Las Vegas, Orlando (Florida), and Carmel, Indiana.