Dinah Casson set up her design practice in 1970 and her partnership with Roger Mann in 1984. Since 1992, Casson Mann has focused most of its work on the design of museums and exhibitions. They have designed permanent galleries for the V&A (including the British Galleries), Imperial War Museum, Natural History Museum, Science Museum, and National Maritime Museum, amongst others. The consultancy has also worked in Russia, the US and extensively in France, including La Cite du Vin in Bordeaux and Le Centre International de l’Art Parietal at Lascaux. Its work has won numerous awards. Dinah has been involved in design education all her working life - as a visiting tutor, lecturer, and external examiner and was course leader of Architecture and Interior Design at the RCA (1993 – 1995). She is currently on the board of the Royal Society of Arts and is a trustee of the Supreme Court Arts Trust. She was a trustee of Towner Eastbourne (2014 – 2024). With her partner Roger Mann, she was elected to the Faculty of Royal Designers for Industry in 2006, of which she was Master from 2011-2013. She is a member of the RDI Summer Sessions panel. In 2018, she was awarded the CBE for services to design and was included in the Design Week inaugural Hall of Fame in 2015. She retired from Casson Mann in 2017 and wrote ‘Closed on Mondays – Behind the Scenes at the Museum’, published by Lund Humphries in 2020.