Who does Lurie credit with being the inspiration for the character of Anna in the novel, Only Children?

Anna is the only one of Lurie's characters to be based on her own acquaintance—her favorite headmistress as a child. Lurie told an interviewer that "In those days professional women were thought to be spinsterish and oppressive . . . She was very much in charge of her own life, yet always warm and kind. She was very good to me and encouraged me to write and draw, and impressed upon my parents the importance of taking me seriously" (Key West Review, Spring 1988).