Karen McCullah (born December 5, 1967) is an American screenwriter and novelist most known for co-writing comedies such as 10 Things I Hate About You, Legally Blonde, Ella Enchanted, The House Bunny, The Ugly Truth, and She's the Man with her screenwriting partner Kirsten Smith. After graduating from James Madison University with a degree in marketing, McCullah worked various jobs before beginning to write. She is a faculty member at Syracuse University's Los Angeles Semester.

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