Miles O'Brien (Star Trek)

Miles O'Brien
Miles O'Brien
The Next Generation / Deep Space Nine character
First appearance	"Encounter at Farpoint" (1987) ; (The Next Generation)
Last appearance	"What You Leave Behind" (1999) ; (Deep Space Nine)
Created by	Gene Roddenberry ; D. C. Fontana
Portrayed by	Colm Meaney
In-universe information
Species	Human
Gender	Male
Position	Professor of Engineering (Starfleet Academy); Chief Operations Officer (Deep Space Nine); Chief Engineer (USS Defiant); Lieutenant (USS Enterprise-D – TNG Season 2 Episode 2); Transporter Chief (USS Enterprise-D – TNG Seasons 1–6); Helmsman (USS Enterprise-D – TNG Season 1); Tactical Officer (USS Rutledge – TNG prior to episode "The Wounded";
Affiliation	United Federation of Planets; Starfleet;
Family	Michael O'Brien (father) ; Brian Boru (ancestor)
Spouse	Keiko O'Brien
Children	Molly O'Brien; Kirayoshi O'Brien;
Origin	Killarney, County Kerry, Ireland, Earth

Miles Edward O'Brien is a character in the Star Trek franchise, portrayed by actor Colm Meaney. O'Brien was originally the transporter chief of the USS Enterprise-D, with a recurring role in all seven seasons of Star Trek: The Next Generation. Promoted to chief of operations for Deep Space Nine, O'Brien became a principal character on the series of the same name. Portrayed in 225 episodes overall, O'Brien is the Star Trek character with the second most appearances in the franchise (exceeded only by Worf, portrayed by Michael Dorn).

O'Brien is the only major Star Trek character described as both ethnically Irish and born in Ireland; Colm Meaney, the actor who portrays him, is Irish. He is also the only regular Star Trek character to be a non-commissioned officer.