Nathaniel Curtis is a British actor. He grew up near Bournemouth and trained at London's East 15 Acting School. He is known for playing Ash Mukherjee in It's a Sin (2021) and for playing Brían in The Witcher: Blood Origin (2022). Nathaniel Curtis is a British actor. He grew up near Bournemouth and trained at London's East 15 Acting School. He is known for playing Ash Mukherjee in It's a Sin (2021) and for playing Brían in The Witcher: Blood Origin (2022).