Marta Kristen: Who She Is & Where She Is in 2026

Quick facts about Marta Kristen:

Born: February 26, 1945

From: Oslo, Norway (raised in the United States)

Real Name: Birgit Annalisa Rusanen (adopted as Martha Annalise Soderquist)

Active Years: 1960s–1980s

Known For: Role as Judy Robinson on Lost in Space

Status Now: Retired, private life

Net Worth: Not publicly confirmed

Marta Kristen is an American actress, best known for her portrayal of Judy Robinson on the classic science-fiction television series Lost in Space, which aired from 1965 to 1968. According to public media profiles, she was born as Birgit Annalisa Rusanen on February 26, 1945, in Oslo, Norway. She was adopted by an American family and raised in the United States, taking the name Martha Annalise Soderquist before adopting her stage name, Marta Kristen. Her role on Lost in Space made her a recognizable figure in 1960s pop culture, and she later appeared in other television shows such as My Three Sons and films like The Incredible Mr. Limpet. Per public reports, she has maintained a relatively low profile in recent decades, with occasional appearances at fan conventions and nostalgia events.

As of 2026, Marta Kristen is 81 years old, having been born on February 26, 1945. Her birth name is Birgit Annalisa Rusanen, and she was born in Oslo, Norway, to a Finnish mother and a German father who was killed during World War II. According to public records, she was adopted by an American couple and grew up in the United States, where she was renamed Martha Annalise Soderquist. She later adopted the stage name Marta Kristen for her acting career. Her background includes a childhood in Michigan and early interest in performing, which led her to pursue acting in Hollywood. She attended local schools and began auditioning for television roles in her teens. Her heritage and adoption story are often noted in biographical profiles, though specific details about her early life remain limited to publicly available accounts.

As of 2026, Marta Kristen is not publicly active in the entertainment industry. According to public sources, she has largely retired from acting and lives a private life away from the spotlight. Occasional fan reports and convention appearances suggest she has attended Lost in Space reunions or nostalgia events in past years, but no recent public activities or projects are confirmed. Her social media presence, if any, is not widely documented, and she does not maintain a public Instagram or other platform under her own name that is easily verifiable. For fans seeking to reconnect with her on-screen persona, her legacy remains tied to her work on Lost in Space, though she has not been involved in new productions. Her current status is best described as retired from public life, with no confirmed professional engagements as of this writing.

Marta Kristen's net worth is not publicly confirmed, as she has not disclosed financial details in recent interviews or public records. Media estimates for classic TV actors from her era vary widely, with some speculative figures ranging from $100,000 to $1 million, but these are not authoritative. Her career primarily spanned the 1960s, with her most prominent role as Judy Robinson on Lost in Space (1965–1968). According to IMDb and other entertainment databases, she also appeared in episodes of My Three Sons, The Incredible Mr. Limpet, and a handful of other TV shows and films. After the 1960s, her acting credits became sparse, with a few minor roles in the 1970s and 1980s. She did not transition to later fame through adult content or OnlyFans, contrary to what some recent search queries might suggest. Her earnings likely came from standard television contracts of the era, with residuals from syndication possibly contributing to her income over the years.

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This profile of Marta Kristen is compiled from publicly available information, including Wikipedia, IMDb, public media interviews, public web search results. Figures such as net worth are widely reported estimates and are not officially confirmed. AI Angels is not affiliated with Marta Kristen.

Last reviewed and updated: 2026-06-25. Compiled and fact-checked by the AI Angels editorial team from publicly available sources.

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