Strassman is a naturalized French citizen she is also fluent in French. As a dialect coach, she worked with Lancôme advertising. She provided voice over work in French for Air France, Euro-star, Disneyland Paris, and for audio tours of The Louvre and the Musée d'Orsay. She would later do French and English dubs, and got into video game voice-over. It was there where she started doing voice-over. She also taught kids, where she was recruited by two women who produced a magazine called Hi-Kids which would produce audio cassettes.

After a year, she was offered a paid position where she trained older French actors on how to act in English. She got an apprenticeship with Studio VO/VF where she trained as a dialect coach. While there, she saw an advertisement calling for actors who could speak English. In an interview with Slink FM, she said she picked psychology as a ways to earn a living in case theatre did not pan out. When she was 20, she had moved to France to study psychology and theatre at CNSAD in Paris. Strassman enjoyed acting at a young age, and was involved in school plays. In live-action productions, she portrayed Jolene in the television show Weeds. The Spell Weaver book series by Annette Marie includes books The Night Realm, The Shadow Weave, and The Blood Curse. Some of her major roles are Kallen Stadtfeld in the Code Geass series, Miyuki Takara in Lucky Star, Nina Fortner in Monster, Rider in Studio Deen's Fate/stay night, Suigintou the first Rozen Maiden doll in Rozen Maiden, Sawako Yamanaka in K-On!, Sola-Ui Nuada-Re Sophia-Ri in Fate/Zero, Momo Hinamori and Soi Fon in Bleach, as well as Sky in the Shantae series and Rouge the Bat in the Sonic the Hedgehog series. Karen Strassman (born June 5 ) is an American stage, television and voice actress who has provided English language voices for Japanese anime shows, animation, and video games.

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