Mystic River is a 2003 American mystery crime drama film directed and scored by Clint Eastwood.
 It stars Sean Penn, Tim Robbins, Kevin Bacon, Laurence Fishburne, Marcia Gay Harden, and Laura Linney.
 The screenplay by Brian Helgeland was based on the novel "Mystic River" by Dennis Lehane.
 The film was produced by Robert Lorenz, Judie G. Hoyt and Eastwood.
 It is the first film on which Eastwood was credited as composer of the score.
Legend is a 2015 French-British crime thriller film written and directed by Brian Helgeland.
 It is adapted from John Pearson's book "The Profession of Violence: The Rise and Fall of the Kray Twins", which deals with the rise and fall of the Kray twins; the relationship that bound them together, and charts their gruesome career to their downfall and imprisonment for life in 1969.
A Knight's Tale is a 2001 medieval adventure-comedy film written, produced, and directed by Brian Helgeland.
 The film stars Heath Ledger, Shannyn Sossamon, Mark Addy, Alan Tudyk, Rufus Sewell, Paul Bettany as Geoffrey Chaucer, and James Purefoy as Sir Thomas Colville/Edward, the Black Prince.
Brian Thomas Helgeland (born January 17, 1961) is an American screenwriter, film producer and director.
 He is most known for writing the screenplays for "L.A. Confidential" (for which he received the Academy Award for Best Adapted Screenplay), "Mystic River", and "".
 Helgeland also wrote and directed "42" (2013), a biopic of Jackie Robinson, and "Legend" (2015), about the rise and fall of the Kray twins.
Paul Schattel is an American film director and screenwriter based in North Carolina.
 Known for his two feature films, "Sinkhole" (2005) and "Alison" (2010), Schattel is currently in development with a horror film, "The Mourning Portrait".
Assassins is a 1995 American action thriller film directed by Richard Donner.
 The screenplay was by Andy and Larry Wachowski and Brian Helgeland.
 The film stars Sylvester Stallone, Antonio Banderas and Julianne Moore.
 The Wachowskis stated that their script was "totally rewritten" by Helgeland, and that they tried to remove their names from the film but failed.
Payback is a 1999 American neo-noir crime film written and directed by Brian Helgeland in his directorial debut, and starring Mel Gibson, Gregg Henry, Maria Bello and David Paymer.
 It was based on the novel "The Hunter" by Donald E. Westlake using the pseudonym Richard Stark, which had earlier been adapted into the 1967 film noir classic "Point Blank", directed by John Boorman and starring Lee Marvin.
 In 2006 Helgeland issued a director's cut that differs substantially from the version released by the studio.
Paul Bettany (born 27 May 1971) is an English actor.
 He is known for his voice role as J.A.R.V.I.S. and the Vision in the Marvel Cinematic Universe, specifically the films "Iron Man" (2008), "Iron Man 2" (2010), "The Avengers" (2012), "Iron Man 3" (2013), "" (2015) and "" (2016), for which he garnered praise.
 He first came to the attention of mainstream audiences when he appeared in the British film "Gangster No. 1" (2000), and director Brian Helgeland's film "A Knight's Tale" (2001).
 He has gone on to appear in a wide variety of films, including "A Beautiful Mind" (2001), "" (2003), "Dogville" (2003), "Wimbledon" (2004), and the adaptation of the novel "The Da Vinci Code" (2006).
The Order, also known as The Sin Eater, is a 2003 mystery horror film written and directed by Brian Helgeland, starring Heath Ledger, Benno Fürmann, Mark Addy, and Shannyn Sossamon.
 Helgeland directed Ledger, Addy and Sossamon in the 2001 film "A Knight's Tale".
Green Zone is a 2010 war thriller film directed by Paul Greengrass.
 The storyline was conceived from a screenplay written by Brian Helgeland, based on a 2006 non-fiction book "Imperial Life in the Emerald City" by journalist Rajiv Chandrasekaran.
 The book documented life within the Green Zone in Baghdad during the 2003 invasion of Iraq.

Question: Are Paul Schattel and Brian Helgeland both screenwriters?
Answer: yes