Writers and Directors Credits

prod. order	EPISODE	DIRECTOR	WRITTEN BY
1	Pilot: Once Upon A Time In The City Of New York	Richard Franklin	Ron Koslow
2	A Children's Story	Gabrielle Beaumont	B.F.Barnett (pseudo Ron Koslow)
3	Siege	Paul Lynch	David Peckinpah
4	Terrible Savior	Alan Cooke	George R.R.Martin
5	No Way Down	Thomas J. Wright	James Crocker
6	The Beast Within	Paul Lynch	Andrew Laskos
7	Masques	Alan Cooke	George R.R.Martin
8	Nor Iron Bars A Cage	Thomas J. Wright	Story by Alex Gansa & Howard Gordon and Ron Perlman Teleplay by Alex Gansa & Howard Gordon
8	Song Of Orpheus	Peter Medak	Alex Gansa & Howard Gordon
9	Dark Spirit	Thomas J. Wright	Robin Bernheim
11	An Impossible Silence	Christopher Leitch	Alex Gansa & Howard Gordon
12	Shades Of Grey	Thomas J. Wright	George R.R.Martin & David Peckinpah
13	China Moon	Christopher Leitch	Cynthia Benjamin
14	The Alchemist	Thomas J. Wright	Story by Richard Setlowe Teleplay by Alex Gansa & Howard Gordon
15	Temptation	Gus Trikonis	David Peckinpah
16	Promises Of Someday	Thomas J. Wright	George R.R.Martin
17	Down To A Sunless Sea	Christopher Leitch	Don Balluck
18	Fever	Thomas J. Wright	Mark Cassut & Michael Cassutt
19	Everything Is Everything	Victor Lobl	Virginia Aldridge
20	To Reign In Hell	Christopher Leitch	Howard Gordon & Alex Gansa
21	Ozymandias	Frank Beascoechea	George R.R.Martin
22	A Happy Life	Victor Lobl	Ron Koslow
23	Remember Love	Victor Lobl	Virginia Aldridge
24	Ashes...Ashes	Gus Trikonis	Story by Roy Dotrice & Durrell Royce Crays Teleplay by Durrell Royce Crays
25	Chamber Music	Victor Lobl	Ron Koslow
26	God Bless The Child	Gus Trikonis	Alex Gansa & Howard Gordon
27	Dead of Winter	Victor Lobl	George R.R.Martin
28	A Fair And Perfect Knight	Gus Trikonis	P.K.Simonds Jr.
29	Sticks And Stones	Bruce Malmuth	Alex Gansa & Howard Gordon
30	Labyrinths	Daniel Attias	Story by Howard Gordon & Alex Gansa Teleplay by Virginia Aldridge
31	Brothers	Beth Hillshafer	George R.R.Martin
32	A Gentle Rain	Gus Trikonis	Linda Campanelli & M.M.Shelly Moore
33	Orphans	Victor Lobl	Alex Gansa & Howard Gordon
34	The Outsiders	Thomas J. Wright	Story by P.K. Simonds Jr and Alex Gansa & Howard Gordon Teleplay by Michael Berlin & Eric Estrin
35	When The Blue Bird Sings	Victor Lobl	Story by Robert John Guttke Teleplay by Robert John Guttke & George R.R.Martin
36	Arabesque	Thomas J. Wright	Virginia Aldridge
37	The Watcher	Victor Lobl	Linda Campanelli & M.M.Shelly Moore
38	A Distant Shore	Michael Switzer	Marie Therese Squerciatti
39	Trial	Victor Lobl	Story by Howard Gordon & Alex Gansa Teleplay by P.K.Simonds Jr.
40	A Kingdom By The Sea	Gus Trikonis	George R.R.Martin
41	The Hollow Men	Victor Lobl	Story by Andrew Laskos & P.K.Simonds Jr. Teleplay by P.K.Simonds Jr.
42	What Rough Beast	Michael Switzer	Story by George R.R.Martin & Alex Gansa & Howard Gordon Teleplay by Alex Gansa & Howard Gordon
43	Ceremony Of Innocence	Gus Trikonis	Story by George R.R.Martin & Alex Gansa & Howard Gordon Teleplay by George R.R.Martin
44	The Rest Is Silence	Victor Lobl	Story by J.Larry Carroll & David Bennett Carren Teleplay by Ron Koslow
45	Though Lovers Be Lost	Victor Lobl	Ron Koslow & Alex Gansa & Howard Gordon
46	Walk Slowly	Gus Trikonis	Linda Campanelli & M.M.Shelly Moore
47	Nevermore	Victor Lobl	P.K.Simonds Jr.
48	Snow	Gus Trikonis	George R.R.Martin
49	Beggar's Comet	Victor Lobl	George R.R.Martin
50	A Time To Heal	Gus Trikonis	Alex Gansa & Howard Gordon
51	In The Forests Of The Night	Victor Lobl	P.K.Simonds Jr.
52	The Chimes At Midnight	Ron Perlman	Linda Campanelli & M.M.Shelly Moore
53	Invictus	Gus Trikonis	George R.R.Martin
54	The Reckoning	Kenneth R. Koch	Alex Gansa & Howard Gordon
55	Legacies	Gus Trikonis	Story by Alex Gansa & Howard Gordon Teleplay by P.K.Simonds Jr.

The Writers Guild of America (WGA) has a well-defined process for determining credits on projects produced under its jurisdiction. These productions are generally USA-controlled live-action film and TV projects, produced either by studios or major independent producers. In 1999, the WGA began furnishing credits directly to IMDb. The absence of the WGA indicator on earlier credits should not be construed as a sign of unofficial status, merely a sign of age.

In general, the credits determination process works as follows:
When the film is finished shooting, the producer sends a notice to the guild and the writers proposing the writing credits. If any writer disagrees with those credits, or if the proposed credits require mandatory arbitration (e.g., a producer or director sharing a writing credit), a WGA arbitration committee reads all drafts of the script and various supporting materials and determines the actual/official credits.

WRITTEN BY
If there is no source material (novel, play, article, etc.) and the same writers receive credit for both the story and screenplay, the credit is "written by".

STORY BY
The "story by" credit is used when the basic narrative structure was originally written with intent to be used for a movie (as opposed to a short story) and the actual screenplay had different authors. A shared "story by" credit is the minimum awarded to the author of an original screenplay.

If there was previously existing source material but the writer creates a substantially new and different story from the source, then the "screen story" (or "television story") credit is used.

TELEPLAY BY
Finally, the "screenplay by" (or "teleplay by") credit is used to denote the screenplay (teleplay) authorship if the story credit had to be separated as above.

In rare cases, "adaptation by" can be awarded to a writer who shapes the script without qualifying for one of the above credits.

There are other specialized credits used for television programs such as documentaries and audience participation shows.

& vs AND
Within each of these categories, members of a writing team are joined by "&"; teams or writers working on separate drafts are joined by "and".

Source: IMDB {http://us.imdb.com/partners/wga}

Note: The official vhs covers credits of CMo, TA, and POS are evidently wrong about the writers, and the one of Temptation is wrong about writers and director; probably a bad case of copy-paste from the previous one, SOG.