Platt with husband Yuri Lowenthal at the 2016 Saboten Con Platt and Lowenthal co-authored a book called Voice-Over Voice Actor: What It's Like Behind the Mic and follow up Voice-Over Voice Actor: The Extended Edition, which gives tips and information for aspiring voice actors.

They also created a live-action web-series Shelf Life about a group of superhero figurines the series ran for four seasons on YouTube. In 2004, Platt and husband Yuri Lowenthal founded Monkey Kingdom Productions, an independent film production company which has produced two feature films including Lowenthal's Tumbling After, and mockumentary Con Artists. She played Juliet in Romeo and Juliet (with both the Pasadena Civic and the Toyota Youth Shakespeare Series with the Los Angeles Philharmonic) Titania in A Midsummer Night's Dream Katherine in The Taming of the Shrew and appeared in First Nights: Clara and Robert Schumann at the Walt Disney Concert Hall as Clara Schumann, in a role written for her by de Lancie. Platt has also performed in shows written and directed by John de Lancie. On screen, Platt has appeared in television shows like Scandal, Hawaii Five-0, Castle and Revenge, as well as the feature film The Call. She lived in New York and worked off-Broadway, and later moved to Los Angeles.

She also studied at the London Academy of Theatre. She went to Rutgers University's Mason Gross School of the Arts in New Brunswick, New Jersey, where she earned her Bachelor of Fine Arts in theatre arts in 1999. Platt moved around a lot when she was young, and her family settled in Chelsea, Michigan when she was 14. Platt speaking with fans at the 2016 Saboten Con

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