In 2012, the company acted as an underwriter for The Museum of Fine Arts, Houston, and announced it would be a Supporting Sponsor for the Alley Theatre and the 2012-2013 Houston Symphony Family Concert Series.
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He co-starred in Ken Ludwig's musical The Gershwins' An American in Paris at the Alley Theatre, Houston, Texas, in 2008.
She has also appeared in Regional theatre productions at such theatres as the Kennedy Center, the Walnut Street Theatre, the Alley Theatre, the Goodspeed Opera House, and Syracuse Stage to name just a few.
The American premiere was in Houston in 2000, then later off-Broadway in 2001, by Alley Theatre at the Century Center for the Performing Arts, directed by David Esbjornson.
Katherine Philips' translation of Pierre Corneille's Pompée is successfully produced at the Theatre Royal, Dublin (Smock Alley Theatre), the first English language play written by a woman to be performed on the professional stage.
Gallen has made numerous live appearances around Ireland, on both sides of the border, in venues such as The Millennium Forum, Derry, The Alley Theatre, Strabane and The World Famous Glencarn Hotel, Castleblayney.