Marion joined Allford Hall Monaghan Morris in 2003. Since then she has worked on a wide range of London based projects including The Johnson Building, Adelaide Wharf in Hackney, and The Angel Building. Marion was the Project Architect for the Biscuit Factory masterplan, including the first phase on the 4.3 hectare Peak Freans factory site in Bermondsey. She was Project Architect for Westminster Bridge Road, a mixed-use student accommodation and sixth form college scheme in Waterloo, and for Weston Street, an apartment building near London Bridge for Solidspace. She has most recently been leading the transformation of a former prison site in north London to create new social housing. Marion was promoted to Associate in 2014 and Associate Director in 2021.