Masterson was born in Dublin and grew up in the Gardiner Street and Mountjoy Square area of the inner city.
In his student days, he was among a group who set up the Simon Community in Ireland.
[2] Masterson, in his role in social services, first appeared on television as a panellist on various current affairs shows.
Masterson returned to RTÉ and worked as producer alongside Pat Kenny and Ryan Tubridy during their tenures as host of The Late Late Show.
[5] Masterson died after a period of illness on 14 April 2024, at the age of 74.