Emma Thynn, Marchioness of Bath

Emma Clare McQuiston was born on 26 March 1986, in London, the daughter of a Nigerian father and an English mother. Her father, Chief Oladipo Jadesimi, is a Nigerian oil billionaire who is the executive chairman of Lagos Deep Offshore Logistics Company and is a titleholder in the Nigerian chieftaincy system, while her mother, Suzanna McQuiston, is an English socialite. She has several half-siblings, including Amy Jadesimi.

McQuiston was raised in South Kensington. She was head girl at Queen's Gate School during her secondary education and later attended University College London to study art history. After university, she studied classical acting at the London Academy of Music and Dramatic Art.After her marriage, she became chatelaine of Longleat's estate and safari park. There, she founded the food and lifestyle brand Emma's Kitchen. She was featured alongside her husband in All Change at Longleat, a three-part documentary filmed in 2014 and broadcast on BBC One in September 2015.

In 2017, she became a brand ambassador for Fiorucci. She also modelled for Dolce & Gabbana, walking in runway shows at Harrods.

In February 2018, Lady Bath began working as a fashion editor at British Vogue. She is also contributing editor at HuffPost.

Prior to the wedding of Prince Harry and Meghan Markle, media outlets listed Lady Bath along with Princess Angela of Liechtenstein, Princess Keisha Omilana of Ipetu-Ijesha, Princess Sikhanyiso Dlamini of Swaziland, Princess Ariana Austin Makonnen of Ethiopia, Princess Sarah Culberson of Bumpe, Cécile de Massy, and Monica von Neumann as modern examples of black royal and noble women. A resurgence of articles about African royalty and nobles of African heritage, including Lady Bath, occurred after the British royal wedding.

In August 2024, Lady Bath took part in the nineteenth series of Celebrity MasterChef on BBC One, where she was eliminated in the third heat.