Amy Louise Acker (born December 5, 1976) is an American actress. She is best known for starring as Winifred Burkle and Illyria on the supernatural drama series Angel (2001–2004), as Kelly Peyton on the action drama series Alias (2005–2006), and as Root on the science-fiction drama series Person of Interest (2012–2016). From 2017 to 2019, she starred as Caitlin Strucker on the superhero drama series The Gifted, based on Marvel Comics' X-Men.
Early life Amy Louise Acker was born and raised in Dallas, Texas, the eldest of four children. Her mother is a homemaker and her father is a lawyer. She studied ballet and modern dance for fourteen years, but ended her lessons while in high school after an operation on one of her knees. She graduated from Lake Highlands High School in Dallas in 1995, and subsequently earned a bachelor's degree in theater from Southern Methodist University in 1999.
In her junior year of college, Acker modeled for the J. Crew catalog. She worked as a stage actress for several seasons, including a stint at American Players Theatre in Spring Green, Wisconsin.
Career Acker made her major television debut when she starred as Winifred "Fred" Burkle in Angel (seasons 2–5), and also as the character of Illyria for part of the show's fifth and final season. She won the 2003 Saturn Award for Best Supporting Actress on Television for her portrayal.
Acker joined the cast of Alias in 2005 for its final season, playing villainess Kelly Peyton. Acker graduated from guest star to cast member as the show entered the final episodes in April and May 2006. Also in 2005, Acker provided voice acting for the character of Huntress (Helena Rosa Bertinelli) on the animated series Justice League Unlimited. She went on to make a guest appearance on How I Met Your Mother, in which she was reunited with Angel co-star Alexis Denisof, who had a recurring role on the show.
Acker portrayed Dr. Claire Saunders/Whiskey, a recurring character, on Joss Whedon's Dollhouse. She guest-starred in 10 of the 13 episodes of the first season and three episodes of the second.
In 2010, Acker was a series regular in the ABC drama Happy Town, portraying the character Rachel Conroy. That same year, she starred in the season-one finale of the Fox series Human Target as the mysterious Katherine Walters. On May 25, 2010, she appeared on CBS's The Good Wife. She appeared in the horror movie The Cabin in the Woods, released April 13, 2012. In 2012, she made guest performances in Warehouse 13, Once Upon a Time, and Grimm. Also in 2012, she starred as Beatrice in Joss Whedon's film Much Ado About Nothing.
Acker appeared in season three of the sitcom Husbands as Claudia, Brad Kelly's ex-fiancée who unexpectedly shows up. In March 2014, Acker was cast as Audrey Nathan, a former lover to Phil Coulson in an episode of Agents of S.H.I.E.L.D.
Between 2012 and 2016, Acker portrayed Samantha "Root" Groves on the CBS drama Person of Interest; Groves became a regular character starting in the series' third season. Starting with the series' 100th episode, Acker took on the voice role of the Machine. In the series finale, she also appeared as the visual manifestation of the Machine.
In March 2017, Acker was cast as Caitlin Strucker in the pilot for the prospective Fox television series The Gifted, which was picked up to series in May 2017. The Gifted began airing on October 2, 2017, and Fox canceled the series after two seasons on April 17, 2019.
Following the conclusion of The Gifted, Acker was cast in 2019 as Kathleen Shepherd, the fourth sister of Derek Shepherd, in an episode of ABC's Grey's Anatomy. She followed this with a recurring arc as Catherine in the third season of Fox's 9-1-1: Lone Star in 2022.
Acker returned to a main cast role in 2023, starring as Tory in Freeform's mystery thriller The Watchful Eye. She also appeared in the 2024 theatrical film Ordinary Angels, starring Hilary Swank.
Personal life
Acker married actor James Carpinello in 2003.
Filmography
Film Year Title RoleNotes2001The AccidentNina2002Groom LakeKateCatch Me If You CanMiggy2006The NoviceJill Yarrut200921 and a Wake-UpCaitlin Murphy2011SironiaMolly Fisher2012The Cabin in the WoodsWendy LinMuch Ado About NothingBeatrice2014Let's Kill Ward's WifeGina2016The Energy SpecialistClaire2017Amanda & Jack Go GlampingAmanda2020Superman: Red SonLois Lane (voice)Direct-to-video A green check mark indicates that a role has been confirmed using a screenshot (or collage of screenshots) of a title's list of voice actors and their respective characters found in its credits or other reliable sources of information.2020OutsideWomanShort film; also co-director2024Ordinary AngelsTheresa2024Average JoeDenise2025The Unbreakable BoyLoriTBAInvaderDianeAnnounced October 2025
Television Year Title Role Notes1997WishbonePriscilla / Catherine Morland / VenusEpisodes: "A Bone of Contention", "Pup Fiction", "The Roamin' Nose"1999To Serve and ProtectMelissa JorgensenEpisode: "Part II"2001–2004AngelWinifred "Fred" Burkle / IllyriaRecurring role (season 2); Main role (seasons 3–5)2003Return to the Batcave:The Misadventures of Adam and BurtBonnie LindsayTelevision film (CBS)2004Johnny BravoJackie, Cashier (voice)Episode: "Double Vision"2005SupernaturalAndrea BarrEpisode: "Dead in the Water"2005–2006Justice League UnlimitedHuntress / Helena Bertinelli (voice)4 episodesAliasKelly PeytonMain role (season 5); 13 episodes2006How I Met Your MotherPenelopeEpisode: "Come On"2007DriveKathryn Tully3 episodesLaw & Order: Criminal IntentLeslie LeZardEpisode: "Smile"Ghost WhispererTessaEpisode: "Weight of What Was"2008VoicesEllie DalyTelevision film (a.k.a. A Near Death Experience)Fire and Ice: The Dragon ChroniclesPrincess LuisaTelevision film (Syfy)October RoadGirl in Blue Uniform / Jenny Bristol2 episodesPrivate PracticeMolly MadisonEpisode: "A Family Thing"2009–2010DollhouseDr. Claire Saunders / WhiskeyRecurring role; 14 episodes2010Human TargetKatherine WaltersEpisode: "Christopher Chance"Trish ArkinEpisode: "Running"Happy TownRachel ConroyMain role; 8 episodesNo Ordinary FamilyAmanda GraysonEpisodes: "No Ordinary Mobster", "No Ordinary Accident"2011Dear SantaCrystal CarruthersTelevision film (Lifetime)2011, 2013CSI: Crime Scene InvestigationSandy ColfaxEpisodes: "Man Up", "Backfire"2012GrimmLena MarcenkoEpisode: "Tarantella"Once Upon a TimeAstrid / NovaEpisode: "Dreamy"Warehouse 13TraceyEpisode: "The Ones You Love"2012–2016Person of InterestSamantha "Root" GrovesGuest role (season 1); Recurring role (season 2);Main role (seasons 3–5); 65 episodes2013Scooby-Doo! Mystery IncorporatedNova (voice)4 episodes2014Agents of S.H.I.E.L.D.Audrey NathanEpisode: "The Only Light in the Darkness"2015A Novel RomanceSophieTelevision film (Hallmark)SuitsEsther Litt-Edelstein5 episodes (seasons 5, 8–9)2016–2017MacGyverSarah AdlerEpisodes: "Metal Saw", "Screwdriver"2016A Nutcracker ChristmasLilyTelevision film (Hallmark)2017–2019The GiftedCaitlin StruckerMain role2019What Just Happened??! with Fred SavageDr. Rachel LayneEpisode: "Family"Grey's AnatomyKathleen ShepherdEpisode: "Good Shepherd"2020God Friended MeTammyEpisode: "Almost Famous"2021All RiseGeorgia KnightEpisodes: "Georgia", "Leap of Faith"Crashing Through the SnowMaggieTelevision film (Hallmark)20229-1-1: Lone StarCatherine6 episodes (season 3)2023The Watchful EyeToryMain role2025Chicago MedHeather WilliamsEpisode: "The Book of Archer"
Web Year Title Role Notes2008Who Cut the Cake?Ellen3 episodes2013HusbandsClaudia"I Do Over" installment2015–2017Con ManDawn Jones8 episodes
Awards and nominations Year Association Category Work Result Refs2001Saturn AwardsCinescape Genre Face of the Future Award - FemaleAngel2002Saturn AwardsBest Supporting Actress on TelevisionAngel2003Saturn AwardsBest Supporting Actress on TelevisionAngel2004Satellite AwardsBest Supporting Actress - Drama SeriesAngel2004Saturn AwardsBest Supporting Actress on TelevisionAngel2014Indie Series AwardsBest Guest Star – ComedyHusbands
References
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