Sylvia O'Brien was a Dublin-born actress and singer.

Little is known of her personal life, but she may have hailed from the Ascendancy

Ascendancy

Ascendancy is a 4X science fiction turn-based strategy computer game. It was originally released for MS-DOS in 1995 and was updated and re-released for iOS in 2011 by The Logic Factory. Ascendancy is a galactic struggle to become the dominant life force; hence the title. The game's introductory...

 that largely ceased to exist following the establishment of the Irish Free State

Irish Free State

The Irish Free State was the state established as a Dominion on 6 December 1922 under the Anglo-Irish Treaty, signed by the British government and Irish representatives exactly twelve months beforehand...

 in 1922, following the Irish War of Independence

Irish War of Independence

The Irish War of Independence , Anglo-Irish War, Black and Tan War, or Tan War was a guerrilla war mounted by the Irish Republican Army against the British government and its forces in Ireland. It began in January 1919, following the Irish Republic's declaration of independence. Both sides agreed...

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Career

She made her way to New York and appeared in numerous stage productions on Broadway, the last one being the musical Me and My Girl

Me and My Girl

Me and My Girl is a musical with book and lyrics by Douglas Furber and L. Arthur Rose and music by Noel Gay. It takes place in the late 1930s in Hampshire, Mayfair, and Lambeth....

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According to Internet Broadway Database, O'Brien appeared in the following Broadway productions. It is apparent from the roles she garnered that her career path onstage followed a generally upward trajectory.

• Me and My Girl
  Me and My Girl
  Me and My Girl is a musical with book and lyrics by Douglas Furber and L. Arthur Rose and music by Noel Gay. It takes place in the late 1930s in Hampshire, Mayfair, and Lambeth....
  
  (musical) as "Maria" (8/10/86 - 12/31/89)

• Da
  DA
  DA, da, or dA may refer to:* Da , a Tony-winning play by Hugh Leonard* Da , a movie adaptation of the play by Hugh Leonard* Adi Da, a spiritual leader once known as Da Free John, and Da Love-Ananda...
  
  (drama) as "Mother" (5/1/78 - 1/1/80)

• My Fair Lady
  My Fair Lady
  My Fair Lady is a musical based upon George Bernard Shaw's Pygmalion and with book and lyrics by Alan Jay Lerner and music by Frederick Loewe...
  
  (musical revival) as "Mrs. Pearce" (03/25/76 - 2/20/77)

• Dear Oscar (comedy) as "Comtesse" (11/16/72 - 11/19/72)

• Conduct Unbecoming (drama) as "Mrs. Mem Strang" (10/12/70 - 2/14/71)

• Hadrian VII (drama) as "Agnes" and "Mrs. Crowe" (standby; 1/8/69 - 11/15/69)

• The Loves of Cass McGuire (comedy) as "Alice" (10/6/66 - 10/22/66)

• The Passion of Josef D. (drama) 2/11/64 - 2/22/64; ensemble)

Death

Notice of her death was not publicly released and the only mention was a tiny paid personal obituary in the Sunday New York Times (May 14, 2006) which was very poorly composed and went as follows: "Singer starred on Broadway in "DA" appeared in numerous other productions, Television and Films. She leaves her daughter, Charmian and husband, Producer Richard Seader."