Michelle Christine Trachtenberg (October 11, 1985 – February 26, 2025) was an American actress. After beginning her career in TV commercials at age three, she made her television debut in her first credited role on the Nickelodeon series The Adventures of Pete & Pete (1994–1996) and her feature debut in the 1996 film Harriet the Spy. As a child actress, Trachtenberg starred in several Nickelodeon productions. In 1997, she won a Young Artist Award for her performance in CBS's sitcom Meego.

Trachtenberg found success on the supernatural drama series Buffy the Vampire Slayer (2000–2003) as Dawn Summers, the younger sister of the show's title character, a role which won her another Young Artist Award and earned her three Saturn Award nominations. She was also nominated for a Daytime Emmy Award for her role as the host of the Discovery Kids series Truth or Scare (2001–2003). In her late teens and early 20s, Trachtenberg rose to further prominence in the film EuroTrip (2004) and as Georgina Sparks on the CW series Gossip Girl (2008–2012). During the mid-2000s, she also had a starring role in the film Ice Princess (2005) and supporting roles in the films Mysterious Skin (2004) and Black Christmas (2006). She also starred on the NBC series Mercy (2009–2010).

In the 2010s, Trachtenberg starred in several television films, including Killing Kennedy (2013) and Sister Cities (2015), and in the science fiction film The Scribbler (2014). She provided the lead voice of Judy in Facebook Watch's adult animated web series Human Kind Of (2018) and executive produced the teen drama web series Guidance (2015–2017) and Tubi's true crime series Meet, Marry, Murder (2021).

Michelle Christine Trachtenberg was born on October 11, 1985, in New York City, to Lana, a bank manager, and Michael Trachtenberg, a fiber-optics manager.^[1] Her parents were Jewish immigrants; her father was from Germany and her mother was from Russia.^[2][3][4] Her mother helped her learn some Russian for a role in 2013.^[5] In an interview in November 2013, Michelle said that her father had died recently.^[6] Her grandparents reside in Israel.^[7][8] She had an older sister named Irene.^[3]

Trachtenberg was raised in Sheepshead Bay, Brooklyn, where she attended junior high school at The Bay Academy for the Arts and Sciences.^[9] Her family later moved to Los Angeles, where she attended Notre Dame High School in Sherman Oaks.^[3][1] She said in a later interview and on social media that she was bullied in school.^[10][11] She was a youth representative for the launch of an anti-drug campaign with President Bill Clinton.^[12] She never married nor had any children, and her dating life was largely unknown to the public.^[13] At the time of her death she had been in a long-term romantic relationship with her agent, Jay Cohen, for five years.^[14][15]

Trachtenberg made her first TV appearance at age three in a commercial for Wisk detergent.^[16] She would eventually play featured roles in more than 100 commercials.^[16] She made her television debut in an episode of the crime drama Law & Order,^[17] before gaining recognition on the Nickelodeon series The Adventures of Pete & Pete as Nona F. Mecklenberg.^[18] During the same period, she played Lily Montgomery on the soap opera All My Children.^[19]

Trachtenberg's film career began in 1996 with the title role in Harriet the Spy, for which she had to leave The Adventures of Pete & Pete while its third season was running.^[20] She then starred in the short-lived television series Meego, which garnered her a Young Artist Award.^[21] She returned to film in 1999 for Inspector Gadget. She also starred in the film Can't Be Heaven. In 2000, she began playing Dawn Summers, the younger sister of the title character (played by Sarah Michelle Gellar) in Buffy the Vampire Slayer.^[22] She also hosted the Discovery Kids series Truth or Scare from 2001 to 2003, for which she was nominated for a Daytime Emmy Award.^[23][19]

In 2004, after Buffy and Truth or Scare, Trachtenberg appeared as Jenny in the teen comedy film EuroTrip.^[24] That same year, Trachtenberg played Wendy in Mysterious Skin, Gregg Araki's film adaptation of Scott Heim's novel. Wendy is the best friend of Neil (Joseph Gordon Levitt), a teenage hustler in small-town Kansas. The film debuted at the 2004 Venice Film Festival.^[25] She also had a recurring role in the HBO series Six Feet Under, as Celeste, a spoiled pop star.^[26]

In March 2005, Trachtenberg starred in Walt Disney Pictures' comedy sports drama film Ice Princess as Casey Carlyle, a science whiz, who is torn between a future in academia and her newfound dream of being a competitive figure skater.^[27]

In April 2006, Trachtenberg guest-starred in the episode of House, "Safe". She revealed on the December 22, 2006, episode of Late Night with Conan O'Brien that House was her favorite show, and that she was friends with one of the producers and had asked to be a guest star.^[28]

In November 2006, Trachtenberg guest starred in season six of the crime drama Law & Order: Criminal Intent. In the episode "Weeping Willow", she played the role of Willow, a kidnapped video blogger, likely based on lonelygirl15.^[29] Trachtenberg also appeared in the Fall Out Boy music video for "This Ain't a Scene, It's an Arms Race", the Joaquin Phoenix-directed music video for "Tired of Being Sorry" by Ringside, and the video for the Trapt song "Echo".

In 2006, Trachtenberg starred in Black Christmas, the remake of the 1974 slasher.^[30] In 2007, she was cast as the female lead in an ABC comedy pilot called The Hill, based on the newspaper of the same name in Washington, D.C.^[31]

Trachtenberg provided the voice of Tika Waylan for Dragonlance: Dragons of Autumn Twilight, a direct-to-video animated film based on the novel of the same name.^[32] She appeared on The CW hit show Gossip Girl, as Georgina Sparks, who recently left rehab and brings back the dark past Serena van der Woodsen desperately wants to leave behind.^[33] She returned to the show for a multiple-episode story arc towards the end of season two.^[34] Trachtenberg appeared in the season three finale and in season four. She also appeared several times in season five, and in almost every episode of season six, the show's final season.^[35] In 2009, Trachtenberg was a cast member on the NBC drama series Mercy, which lasted one season.^[36] She then returned to film, starring in the 2009 teen fantasy comedy 17 Again and had a small role in the comedy Cop Out (2010).^[37]

On June 9, 2011, Trachtenberg guest starred on Love Bites, as Jodie, who, after being unceremoniously dumped, decides – with a vengeance – to accept her ex's offer to "be friends". She reprised the role on June 16, 2011, and in the series finale on July 21, 2011. In the same year, Trachtenberg was a guest star on Weeds during its seventh season,^[38] portraying Emma, a rival pot dealer who causes problems for Silas Botwin. In June 2012, Trachtenberg was cast in the film The Scribbler, produced by Gabriel Cowan.^[39]

In March 2011, she was the featured cover girl in Maxim.^[40] In the Criminal Minds episode "Zugzwang", Trachtenberg played Diane Turner, the criminal stalker of Spencer Reid's girlfriend, Maeve Donovan.^[41]

In late 2015, Trachtenberg starred in the online series Guidance as Anna, the high school guidance counselor.^[42] In 2016, she said she was a member of the Writers Guild of America and that she was working on several writing projects and continued to be inspired by her role in Harriet the Spy.^[43] According to filmmaker Casey Tebo, she had written a screenplay based on the book Toy Monster.^[44][45]

In 2022, Trachtenberg reprised her role as Georgina Sparks in the second season of the HBO revival of Gossip Girl.^[46] In 2023, she had a voice role in Apple TV's animated series adaptation of Harriet the Spy.^[47]

Trachtenberg had been set to make an appearance at SXSW Festival in Austin, Texas on March 12, 2025.^[48]

In early 2024, Trachtenberg addressed concerns on social media regarding her health after some people commented on her apparent weight loss and signs of jaundice. She reassured her followers that she was "happy and healthy".^[49] Trachtenberg underwent a liver transplant at some time "recently" prior to her death.^[50][51]

Trachtenberg was found unresponsive by her mother in her Manhattan apartment on the morning of February 26, 2025.^[52][53] Emergency medical services were called and pronounced her dead at the scene;^[49] she was 39 years old.^[54] Authorities confirmed that her death was not being treated as suspicious.^[55] On February 27, it was reported that New York's Office of Chief Medical Examiner had ruled both the cause and manner of death as undetermined. Trachtenberg’s family, who are Orthodox Jews, had objected to an autopsy for religious reasons, and because there was no suspicion of foul play or criminality associated with her death, the medical examiner did not overrule this objection, leaving that office unable to determine how she died.^[54]

Following her death, numerous celebrities expressed their condolences and paid tribute to Trachtenberg, including her Buffy the Vampire Slayer and Gossip Girl co-stars.^[56][57][58] Harriet the Spy co-star Rosie O'Donnell said, "I loved her very much. She struggled the last few years. I wish I could have helped."^[59]

• Michelle Trachtenberg on Twitter
• Michelle Trachtenberg on Instagram
• Michelle Trachtenberg at IMDb 
• Michelle Trachtenberg at the TCM Movie Database
• Michelle Trachtenberg discography at Discogs