In this rather huge thread I"m searchig for a couple of common names for the following persons - most of the data which I reproduce here, comes out of IMDB: any corrections welcome...

Since these persons are rather confusing I established Upper-Case-Letters (A) to (L) to identify them within this thread. Persons who seem to be clear (like John C. Gallagher) are not included.

The goals of this thread:
• Clarify who is who
• Confirm the credited names
• Destilate common names and birth years where needed -> these are to be published outside of this thread...

There are three things, I'd ask you to help with:
• Confirm that the credits are taken from the feature (not IMDB or any other database) and that they are correct
• Crosslink the credits to the persons - Who is credited for which feature...
• Provide further information about the persons to make it easier to assign them to the features (websites, birthyears, etc.)

The acting Persons:
I"ve added a person for each title I found in the IMDB - take it as unconfirmed proposal...

(A) John A. Gallagher (1955): Producer, Actor, Writer - aka. John Andrew Gallagher, John Gallagher
Born 1955 in Flushing, New York
Known for: The Deli, Blue Moon, Cupidity, Men Lie
Documentation: IMDB as John A. Gallagher

(B) John Gallagher I (????): Actor - aka. Jack Gallagher, John Joseph Gallager
Known for: Rounders, In the Name of the Father, Heartbreak Ridge, Laws of Gravity
Documentation: IMDB John Gallagher I

(C) John Joseph Gallagher (????): Actor - aka. John Joseph Gallager, John Gallager
Known for: Meet the Parents, Extremely Loud and Incredibly Close, The Darjeeling Limited, Repo! The Genetic Opera
Documentation: IMDB as John Joseph Gallagher

(D) Jack Gallagher V (????): Costume Designer
Known for: Educating Rita, Zardoz, The Field, Images
Documentation: IMDB Jack Gallagher V

(E) John Gallagher XXXVII (????): Director - aka. John E. Gallagher, John E. Gallagher III
Known for: Criminal Minds, ER, Third Watch
Documentation: Wikipedia, IMDB as John Gallagher XXXVII

(F) John Gallagher XL (????): Actor
Known for: The Cure
Documentation: IMDB as John Gallagher XL

(G) Jack Gallagher I (????): Producer, Actor
Born in the very beginning of the 20th century
Known for: The Devil Bat
Documentation: IMDB as Jack Gallagher I

(H) Jack Gallagher III (????): Actor
Born in the very beginning of the 20th century
Known for: King Kong, Border Devils
Documentation: IMDB as Jack Gallagher III

(I) Jack Gallagher IV (1953): Actor, Writer - aka. Jack F. Gallagher
Born August 15th, 1953
Known for: Shakes the Clown, Curb Your Enthusiasm, Moneytrack and various TV and Improv shows
Documentation: Wikipedia, IMDB as Jack Gallagher IV
Remarks: The Wikipedia site states that this one has allso appeared in Heartbreak Ridge (B) and Incident at Ruby Ridge (L) - but this seems not to be really proven with references...

(J) John Gallagher Jr. (1984): Actor - aka. John Gallagher
Born June 17th, 1984 in Wilmington, Delaware
Known for: Short Term 12, Pieces of April, Jonah Hex, The Newsroom
Documentation: Wikipedia, IMDB as John Gallagher Jr.

(K) Jack Gallagher VIII (????): Actor
Known for: Dallas, She Knows Too Much
Documentation: IMDB as Jack Gallagher VIII

(L) Jack Gallagher XII (????): Actor
Known for: The Siege at Ruby Ridge
Documentation: IMDB as Jack Gallagher XII

The credits out of CLT:

John Gallagher:
• A Constant Forge: The Criterion Collection - (A) John A. Gallagher
• Criminal Minds: Season 3 - (E) John Gallagher XXXVII
• Criminal Minds: Season 4 - (E) John Gallagher XXXVII
• Criminal Minds: Season 5 - (E) John Gallagher XXXVII
• Criminal Minds: Season 6 - (E) John Gallagher XXXVII
• Criminal Minds: The Second Season - (E) John Gallagher XXXVII - credit confirmed by ateo357
• Curb Your Enthusiasm: The Complete Eighth Season - (C) John Joseph Gallagher
• ETC: Experimental Television Center 1969-2009, Disc 3 - ??
• Falling for Grace - (C) John Joseph Gallagher
• The Good Wife: The First Season - (E) John Gallagher XXXVII
• Heartbreak Ridge - (B) John Gallagher I
• In the Name of the Father - (B) John Gallagher I
• Law & Order: The Twelfth Year: 2001-2002 Season - (C) John Joseph Gallagher
• Men of Respect - (B) John Gallagher I
• Petty Crimes (Aller simple pour Manhattan) - ??
• Repo!: The Genetic Opera - (C) John Joseph Gallagher - credit confirmed by samuelrichardson
• Rounders - (B) John Gallagher I - credit confirmed by AiAustria
• Virus Outbreak - Lautloser Killer (The Cure) - (F) John Gallagher XL

John E. Gallagher:
• ER: Die komplette fünfzehnte Staffel (ER: The Complete Fifteenth Season) - (E) John Gallagher XXXVII
• ER: The Complete Fifth Season - (E) John Gallagher XXXVII
• Mentes Criminales - La Tercera Temporada (Criminal Minds - Season 3) - (E) John Gallagher XXXVII
• Mentes Criminales - Segunda Temporada (Criminal Minds 2) - (E) John Gallagher XXXVII
• Urgences :Saison 5 : Volume 1 : Épisodes 1 à 8 (ER : Season 5) - (E) John Gallagher XXXVII
• Urgences :Saison 6 : Volume 1 : Épisodes 1 à 8 (ER : Season 6) - (E) John Gallagher XXXVII

John E. Gallagher III:
• ER: Die komplette zwölfte Staffel (ER: The Complete Twelfth Season) - (E) John Gallagher XXXVII

Jack Gallagher:
• Best of the Improv: Volume 3 - ??
• Cheers: The Complete Fourth Season - (I) Jack Gallagher IV
• Curb Your Enthusiasm: The Complete Fifth Season - (I) Jack Gallagher IV
• Curb Your Enthusiasm: The Complete First Season - (I) Jack Gallagher IV
• Curb Your Enthusiasm: The Complete Fourth Season - (I) Jack Gallagher IV
• Curb Your Enthusiasm: The Complete Third Season - (I) Jack Gallagher IV
• Dallas: The Complete Fouth Season - (K) Jack Gallagher VIII
• Dallas: The Complete Tenth Season - (K) Jack Gallagher VIII
• The Devil Bat - (G) Jack Gallagher I
• Educating Rita - (D) Jack Gallagher V
• Heartbreak Ridge - (B) John Gallagher I - credit confirmed by AiAustria
• Ja zuster, nee zuster - ??
• King Kong - (H) Jack Gallagher III
• The Manions of America - ??
• Shakes the Clown - (I) Jack Gallagher IV - credit confirmed by ateo357
• The Siege At Ruby Ridge - (L) Jack Gallagher XII
• The Twilight Zone: Season 1 - (I) Jack Gallagher IV
• The Violent Enemy - (D) Jack Gallagher V
• When Stand Up Stood Out (When Stand-Up Stood Out) - ??

John Joseph Gallagher:
• Blood Ties - (C) John Joseph Gallagher
• Boardwalk Empire: The Complete First Season - (C) John Joseph Gallagher
• Chappelle"s Show: The Complete Series - (C) John Joseph Gallagher
• The Darjeeling Limited - (C) John Joseph Gallagher - credit confirmed by AiAustria
• Extremely Loud & Incredibly Close - (C) John Joseph Gallagher - credit confirmed by ateo357
• The Job: The Complete Series - (C) John Joseph Gallagher
• John Adams - (C) John Joseph Gallagher - credit confirmed by ateo357
• Law & Order: Criminal Intent - The First Year - (C) John Joseph Gallagher
• Law & Order: Criminal Intent: Seizoen 9 - (C) John Joseph Gallagher
• Law & Order: Criminal Intent: The Fifth Year - (C) John Joseph Gallagher
• Law & Order: Criminal Intent: The Ninth Year "10 Season - (C) John Joseph Gallagher
• Law & Order: The Eleventh Year: 2000-2001 Season: Disc Five - (C) John Joseph Gallagher
• Law & Order: The Sixteenth Year: 2005-2006 Season - (C) John Joseph Gallagher
• Law & Order: The Tenth Year: 1999-2000 Season - (C) John Joseph Gallagher
• Law & Order: The Third Year - (C) John Joseph Gallagher
• Meet the Parents - (C) John Joseph Gallagher - credit confirmed by AiAustria

John Andrew Gallagher:
• The Deli - (A) John A. Gallagher

John A. Gallagher:
• Posed for Murder - (A) John A. Gallagher

Jack F. Gallagher:
• Cheers: The Complete Fourth Season - (I) Jack Gallagher IV - credit confirmed by AiAustria

John Gallagher Jr:
• Jonah Hex - (J) John Gallagher Jr.

John Gallagher Jr.:
• The Good Student (Mr. Gibb) - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Jonah Hex - (J) John Gallagher Jr.
• Margaret - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• The Newsroom: The Complete First Season - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• The Newsroom: The Complete Second Season - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Pieces of April - (J) John Gallagher Jr.
• Short Term 12 - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Si la cosa funciona (Whatever Works) - (J) John Gallagher Jr.
• The West Wing: The Complete Fourth Season - (J) John Gallagher Jr. (person confirmed by Wikipedia)

John Gallagher, Jr.:
• The Good Student - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Jonah Hex - (J) John Gallagher Jr. (person confirmed by Wikipedia) - credit confirmed by ateo357
• Law & Order: Criminal Intent The Third Year - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Law & Order: Special Victims Unit: Year Ten - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Margaret: Extended Cut - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• The Newsroom - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• The Newsroom: Segunda Temporada Completa (The Newsroom: The Second Complete Season) - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• NYPD Blue: Season 11 - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Olive Kitteridge - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Pieces of April - (J) John Gallagher Jr. (person confirmed by Wikipedia) - credit confirmed by AiAustria
• The West Wing: The Complete Fourth Season: Disc 1 - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• The West Wing: The Complete Series - (J) John Gallagher Jr. (person confirmed by Wikipedia)
• Whatever Works - (J) John Gallagher Jr. (person confirmed by Wikipedia) - credit confirmed by AiAustria

Remark: Please forgive me, not updating this post as frequently as usual. Because of the very small number of entries, I"ve got an spreadsheet in behind, which I"ll copy in every one or two days...

Nobody? 

In the Name of the Father - John Gallagher as Cockney Prisoner

Virus Outbreak/The Cure -> Exterior Guards: John Gallagher

Blood Ties: John Joseph Gallagher as Head Internal Affairs

• The West Wing: The Complete Fourth Season: Disc 1 - (J) John Gallagher Jr. (person confirmed by Wikipedia) - John Gallagher, Jr.


• The West Wing: The Complete Series - (J) John Gallagher Jr. (person confirmed by Wikipedia) -  John Gallagher, Jr. - THIS SHOULD BE REMOVED FROM THE LIST


• Law & Order: The Twelfth Year: 2001-2002 Season - (C) John Joseph Gallagher - John Gallagher


• Law & Order: The Eleventh Year: 2000-2001 Season: Disc Five - (C) John Joseph Gallagher - John Joseph Gallagher
• Law & Order: The Sixteenth Year: 2005-2006 Season - (C) John Joseph Gallagher - John Joseph Gallagher
• Law & Order: The Tenth Year: 1999-2000 Season - (C) John Joseph Gallagher - John Joseph Gallagher
• Law & Order: The Third Year - (C) John Joseph Gallagher - John Joseph Gallagher

Quoting AiAustria:

Quote:
Quoting Scooter1836:

Quote:
• Law & Order: The Twelfth Year: 2001-2002 Season - (C) John Joseph Gallagher - John Gallagher

Can you confirm that this John Gallagher is the same person as in the one credited for the other seasons as John Joseph Gallagher?
And another question: Do you know if the other Law&Order entries in my List (1, 9, 10) are invalid?

I can see.

I did a full audit of all 20 seasons of the original law and order so they are correct

Quoting AiAustria:

Quote:
Quoting Scooter1836:

Quote:
Quoting AiAustria:

Quote:
Quoting Scooter1836:

Quote:
• Law & Order: The Twelfth Year: 2001-2002 Season - (C) John Joseph Gallagher - John Gallagher

Can you confirm that this John Gallagher is the same person as in the one credited for the other seasons as John Joseph Gallagher?
And another question: Do you know if the other Law&Order entries in my List (1, 9, 10) are invalid?

I can see.

I did a full audit of all 20 seasons of the original law and order so they are correct

Thank you.

I'm not really familiar with this series, but now I realized that there are some spin offs... and Law&Order: Criminal Intent is another show...

Yes and there is also Law & Order: Special Victims Unitt and Law & Order: Los Angeles, all spin offs