Brigitte Michael "Mickey" Sumner (born 19 January 1984) is an English actress best known for her film roles as Sophie Levee in Frances Ha (2012) and Farrah in The Mend (2014) and her television roles as Katia on Low Winter Sun (2013) and Bess Till on Snowpiercer (2020).

Sumner garnered significant attention for her role as Sophie Levee, starring opposite Greta Gerwig, in 2012's Frances Ha.

[3] She also made her official off-Broadway debut opposite Carol Kane in the Atlantic Theater Company's The Lying Lesson in April 2013.

In 2013, Sumner acted in a series of films including Half the Perfect World, The Mend and Anesthesia.

Sumner starred in the independent film The Mend, alongside Josh Lucas and Stephen Plunkett.