Tinsley Mortimer emerged as a prominent figure in New York City's social scene, later translating her life of privilege and fashion into a career in reality television. Born Tinsley Randolph Mercer on August 11, 1975, in Richmond, Virginia, she was raised in a well-established family, the daughter of George Riley Mercer Jr. and Dale Tatum Mercer. Her upbringing was one of Southern gentility, and she was educated at the prestigious St. Catherine's School before attending Columbia University, where she studied art history. Her entry into New York society was cemented by her 2002 marriage to Robert Livingston Mortimer, a scion of the banking family, though the couple divorced in 2010.

Mortimer first gained widespread public attention in 2010 as the star of the short-lived CW reality series High Society, which offered a glimpse into her life as a Manhattan socialite and aspiring fashion designer. The show, while brief, established her persona: a woman obsessed with fashion, etiquette, and maintaining a glamorous lifestyle. Her signature style, often featuring feminine dresses, headbands, and a penchant for the color pink, became her trademark. For years, she was a fixture on the New York party circuit and in society pages, cultivating an image that blended old-money elegance with a relatable vulnerability.

Her major career breakthrough came in 2017 when she joined the cast of the Bravo hit The Real Housewives of New York City. As a "friend of" and later a full-time housewife, Mortimer allowed cameras deeper into her personal struggles, including her very public romantic relationship with Scott Kluth and her desire to restart her life and have a family. Her time on the show made her a fan favorite for her emotional transparency and unwavering commitment to her distinctive aesthetic. Alongside her television career, she pursued fashion, launching a handbag line and collaborating with brands like Kate Spade and Resort Collection.

After several seasons on The Real Housewives of New York City, Mortimer left the series in 2020 following her engagement to CouponCabin founder Scott Kluth. The couple married and relocated to Chicago, marking a new chapter away from the New York spotlight. She continues to be involved in fashion endeavors and makes occasional media appearances, maintaining her status as a recognizable personality whose journey from insulated socialite to relatable reality star captivated audiences.