Uggla was born in Toronto, Canada, and grew up in the United Kingdom. She is the second youngest of four siblings. Uggla studied at Bradfield College, Berkshire, before enrolling in the Foundation in Fashion course at Istituto Marangoni in Shoreditch, London.
In August 2018, Uggla demonstrated her commitment to sustainability and founded her first company Riley Studio, a luxury fashion brand driven by an ethos of environmental and social responsibility. With a focus on producing high-quality seasonless pieces, the company quotes simplicity and versatility as its two design pillars. As well as being the founder, Uggla acts as creative director of the company and oversees all design processes and brand direction.
In 2019, Riley Studio was awarded the Ecosia Green Leaf and the Eco-Age Brandmark. In November 2019, the company won the Fashion Brand of the Year title in the Sustainable Lifestyle Awards.
Furthering her aim of promoting sustainability within the fashion industry, in December 2020, Uggla co-founded Renue The Label, a contemporary lingerie brand that specialises in vegan-friendly intimates made from materials that can be “reused, regenerated and renewed”.
The Uggla Foundation was founded in April 2020 by Riley Uggla, her three siblings and their father. The foundation focuses on three main areas: education, health and access to the arts. One of the first targeted initiatives is the establishment of scholarships for exceptionally talented individuals who do not have the financial means to attend higher education. These scholarships will be awarded through The Uggla Family Scholarship programme at the London School of Economics and Simon Fraser University.