He has two older brothers, Charles (born 1987) and Harry, and a younger sister, Fleur.

[citation needed] He trained at Joseph Pearlman's acting academy in Los Angeles.

On his eighteenth birthday,[11][12] Simon received the news that he had been cast as Lancel Lannister in the HBO series Game of Thrones[3][4][5] and as Jerome Clarke in the Nickelodeon series House of Anubis.

[14][15] He appeared in the 2018 production of For King and Country at Southwark Playhouse and the 2019 stage adaptation of A Room with a View at L.A. Theatre Works.

[18] He has been vocal about men's mental health and suicide prevention on social media, appearing on the 2020 Well Beings Virtual National Town Hall & Panel Discussion.