John Michael Bailey
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Bailey has come under fire for his argument that "male-to-female sex changes are motivated primarily by erotic interests and not by the problem of having the gender identity common to one sex in the body of the other." 
- J. Michael Bailey is the Chairman of the Psychology Department at Northwestern University and an internationally recognized expert on the origins of human sexual orientation. His studies of twins have been widely cited in the scientific literature and are mentioned in virtually all introductory psychology textbooks.