He has appeared in the television series Howards End (2017), Little Women (2017), and World on Fire (2019–2023), and in the films The Last Photograph (2017) and A Dog's Way Home (2019).

Hauer-King was raised in Canonbury, North London in architect Jan Kaplický's award-winning designed Hauer-King House, the son of Debra Hauer, an American psychotherapist and former theatre producer originally from Walnut Creek, California, and Jeremy King, a prominent London restaurateur originally from Burnham-on-Sea, Somerset.

[7][8] Hauer-King attended The Hall School, Eton College and then St John's College, Cambridge, where he graduated with a degree in theology and religious studies,[9][7] juggling acting roles on stage and screen whilst he was there.

[9] Hauer-King's first feature was a lead role in Danny Huston's The Last Photograph, which received its world premiere at the Edinburgh International Film Festival.

He played Laurie in the 2017 BBC version of Little Women,[10][11] and starred as Andrius Aras in the film Ashes in the Snow (2018) opposite Bel Powley, Paul Wilcox in Howards End, and as David in Postcards from London (2018).