Acting
Cillian O'Sullivan
New York, USABorn 1989 (36 years old)
4
Films
9
TV Shows
Known For
13 Credits
The Blacklist
as Skip Sutherland
2013
Vikings
as Eirik
2013
Chicago P.D.
as Shane Sullivan
2014
Bull
as Nathan Alexander
2016
Daredevil: Born Again
as Devlin
2025
Star Trek: Strange New Worlds
as Dr. Roger Korby
2022
The Lost Princess
as Alec Touati
2025
In From the Cold
as Chauncey
2022
Then You Run
as Orin
2023
Halo: Nightfall
as Christian Ramsey (uncredited)
2014
The Boy That Never Was
as Dave Garrick
2024
Maze
as Bobby
2017