Question: What is the profession of Tracy Letts?

Context paragraphs:
Howard Starks: Howard Vernon Starks (December 7, 1929-April 7, 2003) was an American poet from the U.S. state of Oklahoma.  He is best known for his poem, "August: Osage County," which was one of the inspirations for Tracy Letts' Pulitzer Prize-winning .

Man from Nebraska: Man From Nebraska is a play by American playwright Tracy Letts, which premiered in 2003 in Chicago.  "Man From Nebraska" is about a man's loss of faith and his journey to regain it.

The Lovers (2017 film): The Lovers is a 2017 comedy romance film directed by Azazel Jacobs.  It stars Debra Winger, Tracy Letts, Aidan Gillen, Melora Walters, Tyler Ross and Jessica Sula.

Caroline Proust: Caroline Proust is a French classically trained actress best known to international audiences for her role as Captain Laure Berthaud in the French TV series Spiral.  She has also appeared in the TV series The Tunnel as well as theatre work including the Tracy Letts play, "August: Osage County" and "Game of Love and Chance".

Tracy Letts: Tracy Letts (born July 4, 1965) is an American playwright, screenwriter and actor.  He received the 2008 Pulitzer Prize for Drama for his play "" and a Tony Award for his portrayal of George in the revival of "Who's Afraid of Virginia Woolf?"  He is also known for his portrayal of Andrew Lockhart in seasons 3 and 4 of Showtime's "Homeland", for which he has been nominated for two Screen Actors Guild Awards as a member of the ensemble.  He currently portrays Nick on the HBO comedy "Divorce".

Bug (play): Bug is a play by American playwright Tracy Letts.  It was adapted into a film in 2006, with Letts writing the screenplay and Michael Shannon reprising his role as Peter.

Killer Joe (film): Killer Joe is a 2011 American Southern Gothic black comedy crime film directed by William Friedkin.  The screenplay by Tracy Letts is based on his 1993 play of the same name.  The film stars Matthew McConaughey in the title role, Emile Hirsch, Juno Temple, Gina Gershon, and Thomas Haden Church.  Friedkin and Letts had similarly collaborated on the 2006 film "Bug".

Superior Donuts (TV series): Superior Donuts is an American sitcom that airs on CBS.  The series aired as a "special preview" on February 2, 2017, following "The Big Bang Theory".  It then premiered in its regular Monday at 9:00 p.m. timeslot on February 6, 2017.  The series is based on the play of the same name by Tracy Letts.

Superior Donuts: Superior Donuts is a play by American playwright Tracy Letts.  Its world premiere was staged by the Steppenwolf Theatre Company in Chicago in 2008, and it premiered on Broadway in 2009.

Lady Bird (film): Lady Bird is a 2017 American comedy-drama film written and directed by Greta Gerwig.  It stars Saoirse Ronan, Laurie Metcalf, Tracy Letts, Lucas Hedges, Timothée Chalamet, Beanie Feldstein, Stephen McKinley Henderson and Lois Smith.

Supporting paragraphs: Superior Donuts (TV series) Tracy Letts
Answer: playwright