
Joan Allen is an American actress. She began her career with the Steppenwolf Theatre Company in 1977, won the 1984 Drama Desk Award for Outstanding Actress in a Play for And a Nightingale Sang, and won the 1988 Tony Award for Best Actress in a Play for her Broadway debut in Burn This. She is also a three-time Academy Award nominee, receiving Best Supporting Actress nominations for Nixon (1995) and The Crucible (1996), and a Best Actress nomination for The Contender (2000).
Gary Michael Cole is an American actor and voice actor. Cole began his professional acting career on stage at Chicago's Steppenwolf Theatre Company in 1985. On television, he has had starring roles in the TV series Midnight Caller, American Gothic, The West Wing, Crusade, The Good Wife, The Good Fight, Veep, Chicago Fire, and Mixed-ish. In film, he has appeared in The Brady Bunch Movie, One Hour Photo, Office Space, Dodgeball: A True Underdog Story, and Talladega Nights: The Ballad of Ricky Bobby. He is also known for voicing the title character on the Adult Swim series Harvey Birdman, Attorney at Law and James Timothy Possible on Kim Possible.

Kathryn Elsbeth Erbe is an American actress. She is best known for her role as Alexandra Eames on Law & Order: Criminal Intent, a spin-off of Law & Order, and Shirley Bellinger in the HBO series Oz.

Moira Jane Harris Sinise is a retired American actress.

Glenne Aimee Headly was an American actress. She was widely known for her roles in Dirty Rotten Scoundrels, Dick Tracy, and Mr. Holland's Opus. Headly received a Theatre World Award and four Joseph Jefferson Awards and was nominated for two Primetime Emmy Awards.

Terry Kinney is an American actor and theatre director, and is a founding member of the Steppenwolf Theatre Company, with John Malkovich, Laurie Metcalf, Gary Sinise, and Jeff Perry. Kinney is best known for his role as Emerald City creator Tim McManus on HBO's prison drama Oz.

Tracy S. Letts is an American actor, playwright, and screenwriter. He received the 2008 Pulitzer Prize for Drama for his play August: Osage County and a Tony Award for his portrayal of George in the revival of Who's Afraid of Virginia Woolf? (2013).
Charles John Mahoney was a British-born American actor. He first became known for his roles in such films as Moonstruck (1987), Eight Men Out (1988), Say Anything... (1989), Barton Fink (1991), and The Hudsucker Proxy (1994). He was best known for playing Martin Crane in the American sitcom Frasier, which aired on NBC from 1993 to 2004. He also worked as a voice actor, and was passionate about his stage work on Broadway and in Chicago theatre. He won a Tony Award for Best Featured Actor in a Play in 1986 for his performance in The House of Blue Leaves.

John Gavin Malkovich is an American actor, voice actor, director, producer, and fashion designer. He received Academy Award nominations for his performances in Places in the Heart (1984) and In the Line of Fire (1993).

Mariann Mayberry was an American television and stage actress.

Tarell Alvin McCraney is an American playwright and actor, and as of July 2017 has been the chair of playwriting at the Yale School of Drama. He is also a member of Teo Castellanos/D Projects Theater Company in Miami and in 2008 became RSC/Warwick International Playwright in Residence at the Royal Shakespeare Company. In April 2010, McCraney became the 43rd member of the Steppenwolf Theatre Ensemble.

Laura Elizabeth Metcalf is an American actress. Over the course of her four-decade career, she has been the recipient of numerous acting awards and nominations. She has won three Primetime Emmy Awards, two Tony Awards, and has been nominated for an Academy Award.

Amy Morton is an American actress and director, best known for her work in theatre. Morton was nominated two times for a Tony Award for Best Actress in a Play for her performances in August: Osage County and Who's Afraid of Virginia Woolf?. On screen, she is known for her performances in films Rookie of the Year (1993), Up in the Air (2009), The Dilemma (2011) and Bluebird (2013). In 2014, Morton began starring as Sergeant Trudy Platt in the NBC drama series Chicago P.D.

Austin Campbell Pendleton is an American actor, playwright, theatre director and instructor. He is a Tony Award nominee and the recipient of Drama Desk and Obie Awards.

Jeffrey Perry is an American actor of stage, television, and film. He is known for his role as Richard Katimski on the teen drama My So-Called Life, Thatcher Grey on the medical drama series Grey's Anatomy, Cyrus Beene on the political drama series Scandal, all for ABC, and as Inspector Harvey Leek on the CBS crime drama Nash Bridges.

William Louis Petersen is an American actor and producer. He is best known for his role as Gil Grissom in the CBS drama series CSI: Crime Scene Investigation (2000–2015), for which he won a Screen Actors Guild Award and was nominated for a Golden Globe Award; he was further nominated for three Primetime Emmy Awards as a producer of the show.

Martha Campbell Plimpton is an American actress, singer, and former model. Her feature film debut was in Rollover (1981); she subsequently rose to prominence in the Richard Donner film The Goonies (1985). She has also appeared in The Mosquito Coast (1986), Running on Empty (1988), Parenthood (1989), Samantha (1992), Raising Hope (2010) and Small Town Murder Songs (2011).

Rondi Reed is an American actress of stage and screen. A longtime member of member of Chicago's Steppenwolf Theatre Company, she has appeared in more than 50 productions at that theater. Also active on Broadway, she won the 2008 Tony Award for Best Performance by a Featured Actress in a Play for her portrayal of Mattie Fae Aiken in August: Osage County. She is best known for the role of Peggy on the television sitcom Mike & Molly which she played from 2010-2016.

Gary Alan Sinise is an American actor, director, musician, producer and philanthropist. Among other awards, he has won a Primetime Emmy Award, a Golden Globe Award, a star on the Hollywood Walk of Fame and was nominated for multiple Tony Awards and an Academy Award.

Lois Arlene Smith is an American character actress, whose career spans seven decades. She made her film debut in the 1955 drama film East of Eden, and later played supporting roles in a number of movies, including Five Easy Pieces (1970), Resurrection (1980), Fatal Attraction (1987), Fried Green Tomatoes (1991), How to Make an American Quilt (1995), Dead Man Walking (1995), Twister (1996), Minority Report (2002), The Nice Guys (2016) and Lady Bird (2017).

Jim True-Frost is an American stage, television and screen actor. He is most known for his portrayal of Roland "Prez" Pryzbylewski on all five seasons of the HBO program The Wire.