American sexologist and geneticist works focuses on biology of gender, sexual identity, gender identity, gender roles, and intersexuality

”explains biological ideas in a feminist perspective”

Uses Dynamic Systems theory from Developmental Psychology. states that the infant and their caregiver, through their way of life, will give the infant a sense of gender/sex in their world

Her influential work includes the 1993 paper “The Five Sexes,” where she proposed an alternative model of gender containing five sexes: male, female, merm, ferm, and herm