Kim Krizan is an American writer and actress best known for originating the story and characters in the Before trilogy with her writing on Before Sunrise (1995) and Before Sunset (2004), for which she was nominated for an Academy Award for Best Adapted Screenplay and a Writers Guild Award. The trilogy is based on characters she created with Richard Linklater. Krizan currently resides in Los Angeles, where she writes and teaches writing courses, most notably at UCLA. In the fall of 2021, she launched a video based writing class on Patreon.

Before Sunset is a 2004 American romantic drama film directed by Richard Linklater, who co-wrote the screenplay with Ethan Hawke and Julie Delpy, from a story by Linklater and Kim Krizan. It is the first film by Warner Independent Pictures. The sequel to Before Sunrise (1995) and the second installment in the Before trilogy, Before Sunset follows Jesse (Hawke) and Céline (Delpy) as they reunite nine years later in Paris.