He is best known for starring as the title role in the West End production of Lin-Manuel Miranda's musical Hamilton, which earned him a Laurence Olivier Award nomination.
He is the grandson of football coach Barry Hermitt; Westman's paternal grandparents immigrated to England from Jamaica as part of the Windrush generation.
[7] Before Hamilton, he had only acted in two professional stage productions, The White Devil at Shakespeare's Globe and Torn at the Royal Court.
[16][17][18][19] He was next cast in the role of Dr George Spencer in the six-part drama The Essex Serpent on Apple TV+, starring Claire Danes and Tom Hiddleston.
In 2019, he said Britain needed to confront its colonial past, and in 2020 he was one of the big names in theatre to sign a letter to industry leaders calling for "urgent reform" to tackle racism and the lack of diversity in the profession.