[1] He is best known for creating, executive producing, and writing the crime drama Love/Hate.
[4] His subsequent play The Empress of India was a commission from the Druid Theatre Company and directed by Tony award winner Garry Hynes.
The series ran from 2010[6] to 2015 on RTÉ One and depicted the world of Dublin's gangs and their families.
Carolan wrote all 28 episodes of Love/Hate during its entire run, and won the IFTA award for Best Television Screenplay for five consecutive years.
[7] In 2018 Carolan executive produced and co-wrote Taken Down[8] for RTÉ, Freemantle, and Arte, a crime series that explored the modern refugee crisis.