Acting

Posey attended the State University of New York at Purchase, where she studied drama.^[6]

Posey got her first break in television with the role of Tess Shelby on the daytime soap opera As the World Turns. Posey's first major role in a feature film was in Dazed and Confused (1993).^[7] The film received favorable reviews from critics and has been identified as a cult classic.^[8]

In 1994, she appeared in Hal Hartley's short film Opera No. 1. Throughout the late 1990s, Posey co-starred in 32 independent films and was nicknamed "Queen of the Indies".^[1] These films include Personal Velocity, Basquiat, Clockwatchers, The Daytrippers, Party Girl and The House of Yes. In particular, she received positive reviews for The House of Yes, for her role as a delusional woman in love with her own brother.^[9][10] In an interview in January 2012, Parker said that the unofficial title has sometimes been a hindrance:

I'm trying to work in studio movies, but they won't hire me. I get feedback from my agent saying, "She's too much of an indie queen." And then on the other side, my name doesn't get the financing to do a movie over $1 million. And I'm called "the indie queen". So it's really a challenging path because I know so much about the indie side of the business. Because I grew up in it ... But it's different times. And this stuff gets projected onto me. People are like, "You're here [at the Sundance film festival] every year, you do so many indie movies." And I'm like, "No, I did Broken English five years ago."^[11]

She has co-starred in many of Christopher Guest's films, including five of his mock documentaries, the first being Waiting for Guffman in 1996. In 1998, Posey appeared in Hartley's film Henry Fool, and the big-budget studio film You've Got Mail.

Posey exiting the premiere of the film Mascots at the Toronto International Film Festival in 2016

In 2000, she starred in Guest's third mock documentary Best in Show and in the big-budget horror film Scream 3. Critical reaction to Posey's performance in the latter film was highly positive and earned her an MTV Movie Award nomination. The next year she starred in Josie and the Pussycats. From 2001 to 2002, she appeared in a supporting role in the popular NBC sitcom Will & Grace.

In 2003, she starred in Guest's A Mighty Wind. The next year she appeared in Sisters of Mercy, Laws of Attraction, and Blade: Trinity. Posey then co-starred in the 2005 film Adam & Steve.^[12]

In 2006, Posey appeared in Superman Returns as Kitty Kowalski, Lex Luthor's ditzy sidekick,^[7] a character based on Eve Teschmacher from the 1978 film Superman. Posey was the only actress considered for the role.^[13][14] Superman Returns was a box-office success.^[15] The film was also successful at the 33rd Saturn Awards. Posey, a few fellow cast members, and the visual effects department were all nominated.^[16] Later the same year, she played the title character in Fay Grim, the sequel to Henry Fool, and appeared in For Your Consideration.

In 2007, Posey was cast in the lead role in the television series The Return of Jezebel James.^[17] The show was originally given a 13-episode order, but the show was cut to seven episodes in anticipation of a pending scriptwriters’ strike.^[18][19] It premiered on the Fox television network in 2008 as a mid-season replacement. However, the show was officially canceled after the third episode aired owing to low ratings.^[20]

Posey starred in Zoe Cassavetes's 2007 film Broken English.^[21] Broken English screened at the 2007 Sundance Film Festival.^[22] It was also entered into the 29th Moscow International Film Festival.^[23] The film was nominated at the 23rd Independent Spirit Awards for Best First Screenplay and Posey was nominated for Best Female Lead.^[24] She was set to co-star in John Waters' film Fruitcake. The film was to be set in her hometown of Baltimore, Maryland.^[25] However, in 2018, Waters announced that he had canceled Fruitcake, saying "I can't get it made... I thought it would do well, but it's not. In this economy, I'm going to have to do a puppet show."^[26]

In 2012, Posey starred in four episodes of the third season of Louie as Liz, Louis C.K.'s love interest. She received positive reviews for her stint on the show. The website Vulture stated: "Posey is superb in a brilliantly written role."^[27] Lindsay Bahr of Entertainment Weekly said "Posey used her arsenal of talent and the material written and directed by C.K. to bring Liz to life".^[28] Andy Greenwald of GrantLand felt Posey was "funny, engaging, and breathless" and went on to call Posey "one of the most gifted actors alive".^[29] Later the same year, she was honored with the Excellence in Acting Award at the Provincetown International Film Festival.

Posey appeared in Ned Rifle, the third and final film in Hartley's Henry Fool trilogy, again reprising her role of Fay Grim.^[30] On November 6, 2013, Hartley launched a fundraising campaign through Kickstarter to produce the film, netting a total of $384,000. Posey, along with several other cast members as well as some crew members, appeared in several videos promoting the campaign.^[31] The film premiered on September 7, 2014, at the 2014 Toronto International Film Festival.^[32] It was also screened in the Panorama section of the 65th Berlin International Film Festival on February 6, 2015.^[33]

In July 2014, it was announced that Posey had signed on to co-star in Woody Allen's mystery drama Irrational Man.^[34] The film had its world premiere on May 16, 2015, at the 2015 Cannes Film Festival.^[35][36] In July 2015, Parker revealed that before being cast in the film, she had considered quitting acting, as she feared that she "saw the independent film movement go away from me... it's a world market now. They're made from real star power. Whoever's hot at the moment." When Allen cast her, she cried, as "the independent film way of working is something that was in my bones. It's like being a part of a punk band but no one's singing punk rock anymore. Only a few bands are able to play, and Woody Allen is one of them. That's why I cried. It was a relief."^[37]

From 2018 to 2021, she appeared as Dr. Smith in Lost in Space, the Netflix remake of the 1965 TV series.^[38]

In 2022 she starred in episode two of Tales of the Walking Dead, an anthology series based on the AMC series The Walking Dead.

As of 2024 Posey is set to star in the upcoming third season of Emmy award winning show The White Lotus, filming is set to take place in Thailand on February 2024^[39]

Stage and music

Posey appeared on Broadway in 2000, playing in Elaine May's Taller Than a Dwarf, which was directed by Alan Arkin. She later appeared off Broadway in David Rabe's Hurlyburly in 2005, and then originated the role of Pony Jones in Will Eno's The Realistic Joneses in 2012.

She learned to play the mandolin to prepare for her role in A Mighty Wind (2003),^[7] a film in which she also sang. She provided vocals on several of her ex-boyfriend Ryan Adams' records. She also played the mandolin on The Dandy Warhols track "I Am Sound" from their Welcome to the Monkey House LP.^[41]

Memoir

You're on an Airplane: A Self-Mythologizing Memoir (2018, Blue Rider Press) is Posey's first book. Centered on the idea that the reader is sitting next to Posey on an airplane, the book mixes personal anecdotes from her career, random observations, stories about her life, and homemade photo collages.^[42][43] The book received critical acclaim. Vogue wrote "Excellent... a celebration of peculiarity." According to Elle magazine, the memoir is "a humour-packed, irreverent, eccentric book packed with personal stories, whimsical how-tos and recipes, as well as collages made by her."^[42] Esquire wrote "Posey is a natural storyteller; performing, in any way really, is mostly about sharing stories. And she's gathered some good ones for her memoir, which also perfectly encapsulates the delightful weirdo you assume she is just by watching her play different people on screen."^[44]

Film

Posey in May 2007

Television

Stage