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Personal Info
Known For
Acting
Birthday
N/A
Place of Birth
New York, USA
Also Known As
- Cillian O'Suilleabhain
- Cillian Ó Súilleabháin
Cillian O'Sullivan
0.8 Popularity
Known For
6.2
Alec Touati
The Lost Princess
2025
8.0
Devlin
Daredevil: Born Again
2025
6.0
Dave Garrick
The Boy That Never Was
2024
5.2
Orin
Then You Run
2023
8.0
Dr. Roger Korby
Star Trek: Strange New Worlds
2022
6.7
Chauncey
In From the Cold
2022
5.2
James
Misty Button
2019
5.9
Bobby
Maze
2017
7.1
Nathan Alexander
Bull
2016
6.8
Christian Ramsey (uncredited)
Halo: Nightfall
2014
Credits
The Lost Princess
as Alec Touati
2025
6.2
Daredevil: Born Again
as Devlin
2025
8.0
The Boy That Never Was
as Dave Garrick
2024
6.0
Then You Run
as Orin
2023
5.2
Star Trek: Strange New Worlds
as Dr. Roger Korby
2022
8.0
In From the Cold
as Chauncey
2022
6.7
Misty Button
as James
2019
5.2
Maze
as Bobby
2017
5.9
Bull
as Nathan Alexander
2016
7.1
Halo: Nightfall
as Christian Ramsey (uncredited)
2014
6.8
Chicago P.D.
as Shane Sullivan
2014
8.4
The Blacklist
as Skip Sutherland
2013
7.6
Vikings
as Eirik
2013
8.1
🎬
Uncle Bill's Barrel
as Tom Lynch
2008
0.0
🎬
Seacht
as Michael
2008
0.0