Personal Info
Known For
Acting
Born
September 28, 1989 (age 36)
Place of Birth
New York, USA
Also Known As
Cillian O'Suilleabhain
Cillian Ó Súilleabháin
Cillian O'Sullivan
Known For
TV
The Blacklist
Skip Sutherland
2013
TV
Chicago P.D.
Shane Sullivan
2014
TV
Vikings
Eirik
2013
TV
Bull
Nathan Alexander
2016
TV
Daredevil: Born Again
Devlin
2025
TV
Star Trek: Strange New Worlds
Dr. Roger Korby
2022
Film
The Lost Princess
Alec Touati
2025
TV
Then You Run
Orin
2023
TV
In From the Cold
Chauncey
2022
TV
The Boy That Never Was
Dave Garrick
2024
Film
Halo: Nightfall
Christian Ramsey (uncredited)
2014
TV
Seacht
Michael
2008
Film
Maze
Bobby
2017
Film
Misty Button
James
2019
Film
Uncle Bill's Barrel
Tom Lynch
2008
Filmography
2025FilmThe Lost Princessas Alec Touati2025TVDaredevil: Born Againas Devlin2024TVThe Boy That Never Wasas Dave Garrick2023TVThen You Runas Orin2022TVStar Trek: Strange New Worldsas Dr. Roger Korby2022TVIn From the Coldas Chauncey2019FilmMisty Buttonas James2017FilmMazeas Bobby2016TVBullas Nathan Alexander2014FilmHalo: Nightfallas Christian Ramsey (uncredited)2014TVChicago P.D.as Shane Sullivan2013TVThe Blacklistas Skip Sutherland2013TVVikingsas Eirik2008FilmUncle Bill's Barrelas Tom Lynch2008TVSeachtas Michael