Who played Mia Dolan in 'La La Land'?

In which film is Glinda a character? Who played J. Robert Oppenheimer in 'Oppenheimer'? Who played Lewis Strauss in 'Oppenheimer'? Who played Evelyn Wang in 'Everything Everywhere All at Once'? In which film is Mia Dolan a character? Who played Sebastian Wilder in 'La La Land'? Who played Terence Fletcher in 'Whiplash'? Who played Chris Washington in 'Get Out'?