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Spoiler warning: Plot and/or ending details follow: The following content contains spoilers!
This page details Miles O'Brien in the primary universe; for the Miles O'Brien in the mirror universe see Miles O'Brien (mirror); for the Miles O'Brien in all other alternate universes see Miles O'Brien (alternates).
For other uses, see O'Brien.
This character is a member of the O'Brien family.

Miles Edward O'Brien was a 24th century Human man, born on September 1, 2332. He has served Starfleet as tactical officer aboard the USS Rutledge during the Federation-Cardassian War, transporter chief aboard the USS Enterprise-D from 2364 to 2369, chief of operations aboard starbase Deep Space 9 from 2369-2375, chief engineer of the USS Defiant from 2371 to 2375, and as an instructor at Starfleet Academy beginning in 2376. In 2383, O'Brien was assigned to oversee construction of the second Deep Space 9 space station.


Early life

Miles O'Brien was born to Michael and Megan O'Brien, and had two brothers, Bill and Cully, and more than one sister. (DS9 episodes: "Invasive Procedures", "Whispers"; DS9 novel: Force and Motion)

In his youth, O'Brien built ships in bottles. (DS9 episodes: "Whispers", "Trials and Tribble-ations" ; TNG episode: "Booby Trap"; TNG novel: Imbalance)

Miles, having grown up in a traditionally Irish setting was a very practical man. Most times (when feasible) he preferred an au naturel approach to food, recreation etc. rather than tech - even though that was a trade he specialized. (TNG episode: "The Wounded")

His pragmatic, "everyman" approach carried over into his DS9 posting. As an enlisted crewman, he saw himself as an equal to his fellow crewmates superior or subordinate and disliked titles, such as "Sir". Always innovative and open to new concepts, O'Brien believed in engineering to be simple for the average Layman. (DS9 episodes: "Visionary", "Trials and Tribble-ations")

His mother raised him to follow the advice about combining talking with eating, "You end up doing neither very well!." (DS9 episode: "The Die is Cast")


O'Brien had a fondness for the sport of kayaking and enjoyed it as a holodeck program. (TNG episode: "Transfiguration", DS9 episodes: "Heart of Stone", "The Adversary", "Change of Heart", "Inquisition")

He also enjoyed racquetball and darts. (DS9 episodes: "Rivals", "Prophet Motive", "Visionary")

Musically O'Brien played the cello and performed several concerts on his various assignments. (TNG episode: "The Ensigns of Command")

Along with his friend, Dr. Bashir, O'Brien enjoyed historical re-creations on the holodeck. O'Brien once created a model of the Alamo. (DS9 episodes: "Once More Unto the Breach", "The Changing Face of Evil", "What You Leave Behind")

The Rutledge

O'Brien was aboard the USS Rutledge during the Cardassian border conflicts and was present to witness the aftermath of the Massacre on Setlik III. During his service there, he had a relationship with the ship's operations officer, Naomi Chao. (TNG episode: "The Wounded", DS9 novelization: Emissary, DS9 episodes: "Tribunal", "Paradise", DS9 novel: Force and Motion)

The Enterprise-D

O'Brien then transferred to the USS Enterprise-D, where he served Captain Picard as a relief Flight controller during the Farpoint Mission. After the mission he served as part of the Enterprise's security and operation divisions, acting mainly as a Transporter chief.(TNG episodes: "Encounter at Farpoint", "All Good Things...", "Lonely Among Us", "Unnatural Selection", "The Best of Both Worlds, Part II"; WizKids module: Attack Wing)

O'Brien under telepathic coercion from Zadeus.

On stardate 43423.6, O'Brien was coerced telepathically by Zadeus to destroy one of the two queens with a transporter. However, Commander Forthol noticed O'Brien was acting strangely when he gave up a winning hand in a poker game with Commander Riker. O'Brien was then freed when Riker, Captain Picard, Commander La Forge and Forthol stopped him from carrying out Zaedus' murder plan. (TNG - Maelstrom comic: "The Hand of the Assassin!")

Deep Space 9

O'Brien was assigned to Deep Space 9 in 2369. (DS9 episode: "Emissary")

In early 2370, during a time of political upheaval on Cardassia, the crew of the Cardassian ship Swift Striker attempted to destroy Deep Space 9 by planting a bomb on its anti-matter reactor. O'Brien worked with Berat, a member of the Cardassian crew who had sought asylum on the station, to remove the bomb and then attached it to the Swift Striker, resulting in the ship's destruction. O'Brien was so impressed with Berat he offered him a position on the station, although Berat chose to return to Cardassia when the political situation changed. (DS9 novel: Betrayal)

Sometime prior to the Battle of Cardassia, Miles was approached to take the position of Professor of Optronic Systems Engineering at Starfleet Academy, a posting he took after some thought, breaking the news to his friend Julian Bashir in the midst of battle. (DS9 episode: "What You Leave Behind")

Starfleet Academy and the Corps of Engineers

In 2376, while teaching at Starfleet Academy, O'Brien assisted the Starfleet Corps of Engineers when an alien artifact threatened to destroy San Francisco. (SCE eBook: Aftermath)

In September 2376, Miles, his wife Keiko, and their children Molly and Kirayoshi, visited Joseph Sisko in New Orleans and later accompanied him to Bajor to attend the birth of his grand-daughter.

While in the Bajoran system, the Chief helped out his old friends on DS9 during the Parasite crisis, and attended Bajor's induction into the United Federation of Planets. (DS9 - Mission Gamma novels: Lesser Evil, Unity)

O'Brien was later detached to the Starfleet Corps of Engineers on the planet Cardassia as a part of the Federation's relief efforts, while Keiko was in charge of the planet's botanical renewal efforts following the Dominion War. (DS9 - Worlds of Deep Space Nine novel: Cardassia: The Lotus Flower, DS9 novel: The Never-Ending Sacrifice)

The new Deep Space 9

In 2383, following the destruction of Deep Space 9, O'Brien was reassigned as chief engineer of both the ground-based facility that substituted for it and the construction of the replacement station. (ST - Typhon Pact novel: Raise the Dawn)

After construction was complete of the new Deep Space 9 O'Brien took over as Chief Engineer of the station. (DS9 - The Fall novel: Revelation and Dust)

In early 2386, O'Brien and Nog travelled to the space station Robert Hooke to visit O'Brien's old commanding officer Benjamin Maxwell, now working as the station's maintenance engineer. While there, they became involved when the station's head Anatoly Finch caused severe damage to the station as a result of a plan to sell his genetically engineered creature "Mother" to Romulan farmers. O'Brien and Nog arranged for the evacuation of most of the station's personnel, although Maxwell was believed dead in the station's destruction. (DS9 novel: Force and Motion)

By 2387, O'Brien had been promoted to Command Master Chief Petty Officer, serving as Captain Ro's right-hand man. (Coda novel: The Ashes of Tomorrow)



USS Rutledge personnel
Emblem of the United Federation of Planets. GarciaKaydenLindMaxwellMeierO'BrienRendellTsaoVolodzhe Seal of the Federation Starfleet.
USS Portia personnel
Emblem of the United Federation of Planets BowmanRyallen CollaDataKilifJohanna KolbeO'BrienPicardShawn RiderVejar Seal of the Federation Starfleet
USS Enterprise (NCC-1701-D) engineering personnel
Federation icon image. AjanianAleakalaAmpalayonAndrewsArgyleBarclayBartelBlakeBrackenBrewerBrunerButlerCarpelliClancyCliffCostaDanilovaDe ShayDella GuardiaDernDiBiasiDonnaDuffyEddiesEl'srykFarrellForestFriedelGomezHeavenlyHessanHinnerHubbellJonesKandelKelsoKihnKociembaKolbKopfKornblumKwanLa ForgeLaVelleLiLeflerLoganLynchMacDougalMaireidMcRobbMoezerMyersNagurskiNaraO'BrienO'ConnorOblataOliverOttoPalmeiroRedbayRobinsonShermanShimodaShipleySinghStoneSutterTaurikT'KaalT'LotaVarleyVukcevokWallaceYeeZelenetsky Starfleet icon image.
see also: medical personnelpilots & flight control personneloperations personnelsecurity & tactical personnelsciences personnelsenior staffunnamed
Starbase Deep Space 9 personnel and residents (original station)
station personnel K. AdabweM. AhzedT. AimatsuAleco V.R. AlfonzoAlle T.AltmanAmranK. AndrewsT. AneN. AponteJ. AsheAylam E.J. S. BashirBattes A.BileckiJ. BlackmerP. BoudreauxS. BowersJ. BroomeCardokCarltonS. CarsonCenn D.J. ChaoJ. ChavezH. CollinsF. CortezCostelloCryanD. CzirakyG. DavisE. DaxJ. DaxDevroS. DouglasM. EddingtonEddonEtana K.Evik N.Gaysd T.Girani S.GoodmanGordimerGreskrendtregkGueretteHageHava R.T. JastJataq'qatS. JonssonKaboKahrimanisKellyKira N.V. KnezoJ. KurlandKurnT. KwiatkowskiS. ch'LarnC. LingP. MatthiasMcCormickMcEwianK. MerimarkMonyodinT. MooreMoruI. MuckerheideMunsonNalan B.J. Si NaranNedani I.Nev R.NguyenNogM.E. O'BrienOccinoOdoD. ParksPertweeH. PetersenPhongsitG. PrimminRedacch'RellenK. RichterRo L.RomG. RonessSangerSarish M.A. SelznerJ. SenkowskiSetrin Y.R. th'ShantShul T.Shula S.SimakB.L. SiskoZ. SlaineJ. SmithN. SthiliW. StinsonM. StrangStrekC. SwannigTaganaS. TaranS. TarsesA. TaverasDarl TavrosTelnorriP. TenmeiTerekT. ch'ThaneTollandM. TomsonT'PeynTrulliE. Vaughnzh'VeskVu K.Wasa G.Wayeh S.D. WilkensWorfWoros K.YamaguchiD. YarrowYevlin M. Emblem of the United Federation of Planets. Bajoran emblem.
Seal of the Federation Starfleet. DS9 insignia.
station residents AluuraA. WyossL. ArlinAriosBarys K.Betenn B.Betenn C.Betenn K.BokatBrocBroikBylaCadaraCaprilChalan A.Chon S.ChramConpapDalba S.DrakV. FontaineA. FontanaFreylaFroolE. GarakGrimpE. GrofHadronHatram N.HetikJas-qalJhakkaKagaKalawLeetaLondar P.MaikiMalor B.Malor T.MardahMartokMirehMo'NekeMornM'PellaKeiko O'BrienKirayoshi O'BrienMolly O'BrienQuarkRasmus S.RhitSardaS'taassN. SardopolousShul AbaJ. SiskoT'AraTaran'atarJ. TharenTigart H.Tir R.Tora Z.TreirVisshKasidy Yates
Starbase Deep Space 9 personnel and residents (second station)
station personnel Aleco V.AllasarE.g. AnsargJ. BashirB. BecerraV. BixxJ. BlackmerP. BoudreauxJ. CandlewoodCardokCenn D.H. CollinsJ. CollinsB. CrusherA. d'ArnaudV. deGromO. DellasantG. DesjardinsEtana K.S. DouglasHava R.B. HerriotE. JuarezV. KnezoS. ch'LarnP. MatthiasK. MerimarkE. MinnarNogM.E. O'BrienD. PhloxS. RavidK. RichterRo L.N. SaygurShul T.Z. SlaineW. StinsonT'LuneP. TenmeiL. ThorneValinarVerlonR.K. VissP. WalenistaZhang S.
station residents Altek D.AluuraBroikDamas H.FroolGrimpKala M.M'PellaOrcamQuarkShmengeUlu L.Zirk



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