Miles O'Brien (Star Trek)

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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)
Significant other	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 appears occasionally in all seven seasons of Star Trek: The Next Generation and is a main cast member of Star Trek: Deep Space Nine. O'Brien was originally the transporter chief of the USS Enterprise-D. He was later promoted to chief of operations of Deep Space Nine. Being portrayed in 225 episodes overall, O'Brien is the Star Trek character with the second most appearances in the Star Trek franchise, second only to Worf (Michael Dorn).^[1]

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.

O'Brien is also the only regular cast member in Star Trek to be a non-commissioned officer.