Judith Butler was born in 1956. She is nationally known for her writings on gender and sexuality. She argues that men and women are not dissimilar and that the notion they are is cultural not biological in books such as Bodies That Matter: On The Discursive Limits Of "Sex" (1993), Excitable Speech: Contemporary Scenes Of Politics (1996), and The Psychic Life Of Power: Theories In Subjection (1997). In Gender Trouble (1990), the title a play on John Waters' camp classic Female Trouble (1975), Butler claims that both gender and drag are a kind of imitation for which there is no original. A professor of philosophy at University of California at Berkeley, Butler attended Yale, receiving a B.A. in 1978 and a Ph.D. in philosophy in 1984.