[2][3][4] Frankel's father died in a road accident when he was two, while his mother was pregnant with his younger brother Max.
[12] That same year, he was cast as the lead Theo Sipowicz in a pilot for a potential NYPD Blue spin-off series on ABC.
[13] In 2021, Frankel appeared as Dominique Renelleau in the BBC One and Netflix true crime drama The Serpent.
[10] As of 2022, he plays Ser Criston Cole, a knight from the Dornish Marches, in the HBO fantasy series House of the Dragon, a prequel to Game of Thrones and adaptation of George R. R. Martin's 2018 fictional history book Fire and Blood.
[15] Frankel also starred opposite Greta Bellamacina in the independent romance film Venice at Dawn.