The Muni:
- Camelot - 1967 - cast included Dennis O'Brien
- Oliver! - 1968 - cast included Dennis O'Brien as Noah Claypool
- Kiss Me, Kate - 1968 - cast included Dennis O'Brien
- Bells Are Ringing - 1969 - cast included Dennis O'Brien
- Annie Get Your Gun - 1969 - cast included Dennis O'Brien
- Li'l Abner - 1970 - cast included Dennis O'Brien
- Man of LaMancha - 1970 - cast included Dennis O'Brien
- Funny Girl - 1971 - cast included Dennis O'Brien
- Fiddler on the Roof - 1971 - cast included Dennis O'Brien
- You're a Good Man, Charlie Brown - 1972 - cast included Dennis O'Brien as Snoopy
- Most Happy Fella - 1972 - cast included Aidan (Barry O'Brien Gilbert
- The Sound of Music - 1972 - production coordination by Dennis O'Brien, cast included Dennis O'Brien
- Once Upon a Mattress - 1973 - cast included Dennis O'Brien as Prince Dauntless the Drab
- Oklahoma! - 1973 - cast included Dennis O'Brien
- Hello Dolly! - 1974 - cast included Dennis O'Brien
- The Music Man - 1974 - cast included Virginia O'Brien as Mrs. Shinn, Aidan (Barry) O'Brien-Gilbert as Winthrop Paroo and Dennis O'Brien
- Guys and Dolls - 1975 - assistant directed by Dennis O'Brien, cast included Dennis O'Brien and Laurie Barnes
- How to Succeed in Business Without Really Trying - 1975 - cast included Virginia O'Brien
- Fiddler on the Roof - 1975 - cast included Laurie Barnes as Grandma Tzeitel and Dennis O'Brien
- Mame - 1975 - cast included Aidan (Barry) O'Brien Gilbert as Young Patrick
- Irene - 1976 - cast included Virginia O'Brien
- Bye, Bye Birdie - 1976 - cast included Virginia O'Brien as Mama Peterson, Dennis O'Brien, Laurie Barnes and Michael Barnes
- Pajama Game - 1979 - cast included Virginia O'Brien
- A Little Night Music - 1981 - cast included Virginia O'Brien as Madame Armfeldt
- You're a Good Man, Charlie Brown - 1985 - cast included Dennis O'Brien as Charlie Brown
- The Sound of Music - 1986 - cast included Dennis O'Brien
- Peter Pan - 1988 - flight direction by Dennis O'Brien, cast included Dennis O'Brien
- Joseph and the Amazing Technicolor Dreamcoat - 1989 - cast included Dennis O'Brien
- Fiddler on the Roof - 1989 - cast included Laurie O'Brien, Dennis O'Brien, Sean O'Brien, Kate O'Brien and Betsy O'Brien
- Teddy & Alice - vocal direction by Laurie O'Brien
- Oliver! - 1991 - cast included Laurie O'Brien as Widow Corney and Kate O'Brien
- Man of LaMancha - 1992 - cast included Dennis O'Brien as The Innkeeper/Governor
- Hans Christian Andersen - 1993 - cast included Dennis O'Brien, Sean O'Brien, Kate O'Brien and Betsy O'Brien
- Peter Pan - 1994 - flight direction by Dennis O'Brien, cast included Kate O'Brien
- Big River - 1994 - assistant directed by Dennis O'Brien
- The King and I - 1995 - assistant directed by Laurie O'Brien, cast included Sean O'Brien as Prince Chulalonghorn and Kate O'Brien
- Meet Me In St. Louis - 1995 - produced by Dennis O'Brien, cast included Betsy O'Brien
- Little Me - 1996 - makeup assistance by Kate O'Brien
- The Wizard of Oz - 1996 - directed by Laurie O'Brien, flight and special effects direction by Dennis O'Brien, assistant musical direction by David Barnes, hair assistance by Kate O'Brien, cast included Bridget O'Brien as Nike, the Flying Monkey and Betsy O'Brien
- Guys and Dolls - 1997 - cast included Sean O'Brien and Kate O'Brien
- Kiss Me, Kate - 1997 - set movement by Kate O'Brien, cast included Dennis O'Brien as Gangster #2
- Bye, Bye Birdie! - 1998 - cast included Kate O'Brien
- Godspell - 1998 - cast included Sean O'Brien
- Annie - 1998 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, assistant musical direction by David Barnes, makeup assistance by Kate O'Brien, cast included Betsy O'Brien
- The Goodbye Girl - 1999 - assistant directed by Dennis O'Brien, stage managed by Sean O'Brien, cast included Betsy O'Brien
- The Sound of Music - 1999 - cast included Laurie O'Brien as the Mother Superior and Kate O'Brien
- Cinderella - 2000 - stage managed by Sean O'Brien, cast included Kate O'Brien and Betsy O'Brien
- The Music Man - 2000 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, assistant musical direction by David Barnes, cast included Conor O'Brien
- West Side Story - 2001 - stage managed by Bridget O'Brien
- Peter Pan - 2001 - flight direction by Dennis O'Brien, cast included Conor O'Brien as the turtle
- Joseph and the Amazing Technicolor Dreamcoat - 2002 - cast included Betsy O'Brien as assistant narrator and Conor O'Brien
- Anything Goes - 2002 - cast included Kate O'Brien
- Mame - 2002 - cast included Betsy O'Brien
- South Pacific - 2002 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, assistant musical direction by David Barnes, cast included Kate O'Brien
- My Fair Lady - 2003 - cast included Dennis O'Brien as Alfred P. Doolitle
- The Wizard of Oz - 2003 - flight direction by Dennis O'Brien
- Big River - 2004 - set movement by Dennis O'Brien and Conor O'Brien
- Ragtime - 2005 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, set designed by Michelle Lilly, assistant musical direction by David Barnes, costume assistance by Kate O'Brien and cast included Betsy O'Brien
- Elton John and Tim Rice's Aida - 2006 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, set designed by Michelle Lilly,assistant musical direction by David Barnes, production coordination by Bridget O'Brien, set crew included Conor O'Brien and cast included Kate O'Brien and Betsy O'Brien
- Okahoma! - 2007 - stage managed by Dennis O'Brien, set designed by Michelle Lilly O'Brien
- All Shook Up - 2008 - set movement by Conor O'Brien
- The Secret Garden - 2008 - directed by Laurie O'Brien, stage managed by Dennis O'Brien, set designed by Michelle Lilly O'Brien, assistant musical direction by David Barnes, set movement by Conor O'Brien and cast included Betsy O'Brien
- The Producers - 2009 - set designed by Michelle Lilly O'Brien
- Fiddler on the Roof - 2009 - assistant directed by Laurie O'Brien, stage managed by Dennis O'Brien
Ursuline Academy
- Cinderella - 1990 - directed by Laurie O'Brien, cast included Sean O'Brien and Kate O'Brien
Glenwood High School (all directed by Laurie O'Brien and produced by Dennis O'Brien):
- The Music Man - 1992
- You're a Good Man, Charlie Brown - 1993
- And Then There Were None - 1993
- Once Upon a Mattress - 1994
- A Few Good Men - 1995
- South Pacific - 1995
- Guys and Dolls - 1996
- Oklahoma! - 1997
- Man of LaMancha - 1998
- The Outsiders - 1998 - cast included Conor O'Brien
- Hello Dolly! - 1999
- Up the Down Staircase - 1999
- Oliver! - 2000 - cast included Conor O'Brien
- Fiddler on the Roof - 2001
- You Can't Take It With You - 2001
- The Wizard of Oz - 2002 (flight direction by Dennis O'Brien)
- Pippin - 2003
- Brigadoon - 2004
- Chicago - 2005
- Anything Goes! - 2006
- Once Upon a Mattress - 2007
- Beauty and the Beast - 2008
- Joseph and the Amazing Technicolor Dreamcoat - 2009
Springfield High School , Springfield, Illinois
- Bye, Bye Birdie! - 1970 - cast included Dennis O'Brien
- The Importance of Being Earnest - cast included Dennis O'Brien as Earnest/Jack Worthy
- The Music Man - 1971 - cast included Dennis O'Brien as a member of the quartet
- Amahl and the Night Visitors - 2001 - cast included Betsy O'Brien as the choir master
- Pirates of Pinzance - 2002 - cast included Betsy O'Brien
- The Crucible - 2002 - directed by Laurie O'Brien and produced by Dennis O'Brien, cast included Betsy O'Brien
- Much Ado About Nothing - 2003 - directed by Laurie O'Brien and produced by Dennis O'Brien, cast included Betsy O'Brien
- Joseph and the Amazing Technicolor Dreamcoat - 2004 - cast included Betsy O'Brien as The Narrator
- Arsenic and Old Lace - 2004 - directed by Laurie O'Brien and produced by Dennis O'Brien
- How to Succeed in Business Without Really Trying - 2007 - cast included Conor O'Brien
- The Diary of Anne Frank - 2007 - cast included Conor O'Brien
- Tom Sawyer, the Musical - 2008 - cast included Conor O'Brien
- Harvey - 2008 - cast included Conor O'Brien as Elwood P. Dowd
Springfield Southeast High School, Springfield, Illinois
- Fiddler on the Roof - 1995 - cast included Sean O'Brien as the Rabbi's son
- Once Upon a Mattress - 1996 - cast included Sean O'Brien as Prince Dauntless the Drab
- Reserve Two for Murder - 1997 - directed by Sean O'Brien
- Sweet Charity - 1998 - cast included Kate O'Brien and Sean O'Brien
- John Lennon and Me - 1998 - cast included Kate O'Brien as The Torturer
- Anything Goes - 1999 - cast included Kate O'Brien
- Arsenic and Old Lace - 1999 - cast included Kate O'Brien as Abby Brewster
- Up the Down Staircase - 2000 - directed by Kate O'Brien
Dominican University, River Forest, Illinois
- Jesus Christ Superstar - 2001 - cast included Kate O'Brien as a Priest
- Sound of Music - 2002 - cast included Kate O'Brien as Sister Sophia
- Singing in the Rain - 2002 - cast included Kate O'Brien
- Pippin - 2004 - cast included Kate O'Brien as Bertha
- Big River - 2004 - cast included Kate O'Brien as The Duke
- Getting Out - 2005 - stage managed by Kate O'Brien
Truman State University, Kirksville, Missouri
- Once On This Island - 2001 - Sean O'Brien, accompanist
- The Most Massive Woman Wins - 2001 - directed by Sean O'Brien
- The Vagina Monologues - 2007 - cast included Betsy O'Brien
Mid-American Playwrights, Springfield, Illinois
- Disciple of the Bournage - - cast included Sean O'Brien
- Big Apple Messenger - - cast included Sean O'Brien
Sangamon State University (now the University of Illinois at Springfield), Springfield, Illinois
- Marat / Sade - 1972 - cast included Dennis O'Brien
- Marvin's Room - 1998 - cast included Sean O'Brien
Wildloon Productions @ Lincoln's New Salem, Petersburg, Illinois
- The Track Home - 2002 - cast included Dennis O'Brien and Conor O'Brien
Theater in the Park, @ Lincoln's New Salem, Petersburg, Illinois
- 1776 - 2000 - makeup assistance by Kate O'Brien, cast included Dennis O'Brien
- Oliver! - 2004 - cast included Betsy O'Brien and Conor O'Brien
- Once On This Island - 2007 - cast included Betsy Betsy
Karls Eberhard University (a/k/a Tuebingen University), Tuebingen, Germany
Lifeline Theater, Chicago, Illinois
Stage Left Theater, Chicago, Illinois
Griffin Theater, Chicago, Illinois
New Leaf Theater
St. Raymond Players, Mt. Prospect, Illinois
1. Once Upon a Mattress - 1980 - cast included Laurie O'Brien and Dennis O'Brien as Sir Harry
Springfield Theatre Centre (f/k/a Springfield Theater Guild):
- Call Me Madam - 1969 - cast included Dennis O'Brien
- Mame - 1970 - cast included Dennis O'Brien
- Hello Dolly! - 1971 - cast included Dennis O'Brien
- The Fantasticks - 1971 - cast included Dennis O'Brien as The Indian Who Dies
- Little Mary Sunshine - 1971 - cast included Dennis O'Brien as Yellow Feather
- Anything Goes - 1973 - cast included Dennis O'Brien as Moonface Martin
- The Best Christmas Pageant Ever - 1987 - cast included Dennis O'Brien, Sean O'Brien, Kate O'Brien and Betsy O'Brien
- Charlotte's Web - 1988 - cast included Sean O'Brien and Kate O'Brien as Goslings
- The Velveteen Rabbit - 1996 - cast included Sean O'Brien as the boy, Kate O'Brien as the Velveteen Rabbit and Betsy O'Brien as the Babiest Bunny
- Babes in Toyland - 1989 - directed by Laurie and Dennis O'Brien, cast included Sean O'Brien, Kate O'Brien, Betsy O'Brien, Morgan O'Brien and Kyle O'Brien
- The Best Little Whorehouse in Texas - 1990 - cast included Dennis O'Brien as The Governor
- The Lion, The Witch and the Wardrobe - 1992 - cast included Dennis O'Brien as Mr. Beaver, Kate O'Brien as the Unicorn and Betsy O'Brien as Wood Nymph #2
- Annie - 1993 - cast included Kate O'Brien and Betsy O'Brien as Tessie
- The Fantasticks - 1995 - cast included Dennis O'Brien as The Indian Who Dies
- Charlotte's Web - 1996 - cast included Dennis O'Brien and Betsy O'Brien
- The Outsiders (ACTT) - 1996 - cast included Sean O'Brien and Conor O'Brien
- Alice in Wonderland - 1997 - cast included Dennis O'Brien as TweedleDee and Kate O'Brien as the Cheshire Cat
- Farenheit 451 (ACTT) - 1997 - directed by Sean O'Brien, makeup designed by Kate O'Brien
- Into the Woods - 2000 - cast included Kate O'Brien as Rapunzel
- To Kill a Mockingbird - 2000 - assistant directed by Dennis O'Brien
- Gus and Dolls Jr. - 2001 - cast included Betsy O'Brien
- Do Patent Leather Shoes Really Reflect Up? (ACTT) - 2002 - directed by Betsy O'Brien
- The Hobbit - 2002 - cast included Dennis O'Brien and Conor O'Brien
- Jesus Christ, Superstar - 2003 - cast included Betsy O'Brien
- Assassins - 2006 - cast included Dennis O'Brien
- Return to the Forbidden Planet (ACTT) - 2007 - Adult consultants, Dennis & Laurie O'Brien, sound by Conor O'Brien
- HONK! (ACTT) - 2008 - assistant directed by Conor O'Brien
- Dessa Rose - 2009 - directed by Laurie O'Brien, stage managed by Dennis O'Brien
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