Susannah Grant (born January 4, 1963) is an American screenwriter, director, and producer.

Grant was born in New York City. She studied at Amherst College and has been admitted to the AFI Conservatory. From 1994 to 1997 she worked on television as the producer and major writer of the Fox drama series "Party of Five." She wrote the screenplays for "Ever After," "Erin Brockovich," directed by Steven Soderbergh, "28 Days," and Disney's "Pocahontas." For "Erin Brockovich" she received an Oscar nomination in 2001.

After her Academy Award nomination, Grant adapted "In Her Shoes" and "Charlotte's Web" for the screen and wrote and directed "Catch and Release," starring Jennifer Garner and Timothy Olyphant. She is also a Miss Porter's School alumna as well as an Amherst College alumna, having graduated in 1984. She later was accepted to the American Film Institute and received the Nicholl Fellowship in screenwriting. Grant was also featured in The Dialogue.

Grant created and produced the CBS series "A Gifted Man" in 2011. She received the Valentine Davies Award in 2011. In September 2013, Grant delivered a screenwriting lecture as part of the BAFTA and BFI Screenwriters' Lecture Series. In 2014, Grant created the ABC drama series Members Only for the 2014–15 American television season.

In 2019, Grant co-created and wrote the Netflix miniseries "Unbelievable," starring Kaitlyn Dever and Toni Collette, adapted from real events.

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