Prof. Costello holds a Ph.D. in sociology from the University of California, Berkeley, and a J.D. from Harvard Law School. Ze researches and teaches in the areas of sex and gender, sociology of the body, medical sociology, sexuality and intersectional identity. Prof. Costello is an advocate and speaker on LGBTQIA issues, and blogs on intersex and trans gender issues. An intersex individual, Prof. Costello was assigned female at birth, and transitioned to male in later adulthood. Ze is married to an intersex woman who was assigned male at birth, and is the gestational father of a teenaged daughter. Prof. Costello may be addressed using the pronouns ze/zir/zim or he/his/him