Directly after graduation, Hart became a teacher. At 25, she began teaching high school students. After eight years of teaching, Hart quit her job to pursue screenwriting. Hart's father and brother are also screenwriters.
Miss Stevens was Hart's directorial debut. Inspired by her experience as a teacher, Miss Stevens follows a teacher as she chaperones three students on a weekend trip to a drama competition. This film premiered at the South by Southwest (SXSW) Film Festival on March 12, 2016. Miss Stevens was nominated for the Grand Jury Award and Gamechanger Award at the festival.
Hart's most recent film Fast Color premiered at South by Southwest in 2018. During the 2018 film festival and conference, 80% of narrative feature competition were films directed or co-directed by women. This film is co-written and produced by Hart's husband Jordan Horowitz.
- TBA: I'm Your Woman (writer and director)
- 2020: Stargirl (director)
- 2018: Fast Color (writer and director)
- 2016: Miss Stevens (writer and director)
- 2014: The Keeping Room (writer)
- 2002: Tuck Everlasting (actress)
- Bernstein, Paula (27 September 2016). "Five Questions for Miss Stevens Writer/Director Julia Hart". Filmmaker.
- Olsen, Mark (5 September 2014). "Toronto Film Festival: 'Keeping Room' a Window into Women, Civil War". Los Angeles Times.
- Berger, Laura (2016-03-10). "SXSW 2016 Women Directors: Meet Julia Hart – 'Miss Stevens'". IndieWire. Retrieved 2018-03-30.
- Robehmed, Natalie (17 March 2018). "Female Directors Come Into Focus At SXSW Film Festival". Forbes.
- Grobar, Matt (11 March 2018). "Why Director Julia Hart Wanted Gugu Mbatha-Raw For 'Fast Color' - SXSW". Deadline Hollywood.