- His first play, Killer Joe, premiered in a 40-seat theatre outside Chicago before eventually transferring to an off-Broadway theatre and London's West End.
- Joined the Steppenwolf Theatre Company's acting ensemble in 2002.
- Won the 2008 Pulitzer Prize for Drama for his play August: Osage County.
- Father Dennis Letts originated the role of August: Osage County patriarch Beverly Weston.
- The only person to have won a Tony Award for acting and a Pulitzer Prize.
- 2008, Tony — Play: Winner
- 2013, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- 2014, Writers Guild Awards — Adapted Screenplay: Nominee
- 2017, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2014, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
- 2013, Tony — Actor (Play): Winner
- 2014, Critics' Choice Movie Awards — Best Adapted Screenplay: Nominee
- Billie Letts — Mother
- Shawn Letts — Brother
- Dana Letts — Brother
- Dennis Letts — Father
- Carrie Coon — Wife
- Attended Southeastern Oklahoma State University, Durant, Oklahoma, United States
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