Judith Flynn Chapman vs. transgender people

Judith Patricia Flynn Chapman (born June 14, 1971) is an American physical anthropologist who was one of the major supporters of the anti-transgender book The Man Who Would Be Queen by J. Michael Bailey. She publishes on hormones and behavior and is involved in the Human Behavior and Evolution Society (HBES), a hereditarian trade group. Chapman and Bailey have been seen together at the HBES conference.


Chapman earned a Bachelor of Arts in Psychology from University of Michigan in 1994 and a Ph.D. in Biological Anthropology from Harvard in 2004. She has taught and advised at Harvard ever since in the Human Evolutionary Biology department. She focuses on hormones and behavior, human sexuality, and stress. She served as Quincy House and College resident dean until 2018.

Chapman is married to lawyer Tyler E. Chapman (born 1968) with two sons who are ten years apart.  


  • Terence C. Burnham
  • Peter T. Ellison
  • Steven W. Gangestad
  • Peter B. Gray
  • Amy Y. Li
  • Susan F. Lipson
  • Matthew H. McIntyre
  • Mary T. O’Rourke
  • Randy Thornhill

Burnham’s dissertation advisor was Edward O. Wilson, the founder of the modern eugenics movement division called evolutionary psychology. Thornhill’s work on rape was covered by Alice Dreger in her defense of Bailey.

Amazon shill review (2003)

J. Michael Bailey supporters united in 2003 for one of the first notable cases of coordinated shill reviews on Amazon. Chapman’s only other review was for the 2000 evolutionary psychology book Mean Genes: From Sex To Money To Food: Taming Our Primal Instincts.

Engrossing and very readable , October 25, 2003 

Reviewer: jflynn@fas.harvard.edu (see more about me) from Cambridge, Ma United States 

As a scientific researcher interested in sex differences and the organizational effects of gonadal steroid hormones on the brain, I found this book immensely interesting and readable. A great overview of the current literature about the biology and early childhood correlates of male homosexuality and transgenderism. I would recommend this book to anyone interested in the biology and ontongeny [sic] of gender. In fact, I might use if for a course next year.

HBES 2003

Testosterone Research, Chair: J. Manning Georgian Room, Saturday Morning 10:15AM

  • Burnham, Terence (Harvard Business School)
  • Flynn Chapman, Judith (Harvard University, Department of Anthropology)
  • Gray, Peter (Harvard University, Department of Anthropology)
  • McIntyre, Matthew (Harvard University, Department of Anthropology)
  • Lipson, Susan (Harvard University, Department of Anthropology)
  • Ellison, Peter (Harvard University, Department of Anthropology)


Variation in human male testosterone levels may reflect, and effect, differential behavioral allocation to mating and parenting effort. This proposition leads to the hypothesis that, among North American men, those involved in committed, romantic relationships will have lower testosterone levels than men not involved in such relationships. Our study is the first to examine whether being in such a relationship (rather than being married) is the meaningful predictor of male testosterone levels. To test this hypothesis, 122 Harvard Business School male students filled out a questionnaire and collected one saliva sample (from which testosterone level was measured). Results revealed that men in committed, romantic relationships had 21% lower testosterone levels than men not involved in such relationships (p = 0.006). Furthermore, the testosterone levels of married men and unmarried men who were involved in committed, romantic relationships did not differ, suggesting that, at least for this sample, male pair bonding status is the more significant predictor of testosterone levels than is marital status. Keywords: testosterone, pair bond, marriage, male reproductive effort

HBES 2006

Session K-3: Physiology/Sexual Orientation Class of 1949 Auditorium
Chair: Matthew H. McIntyre Abstracts pp. 84-85

SU 11:20 Romantic Involvement Often Reduces Men’s Testosterone: The Moderating Role of Extra-Pair Sexual Interest. McIntyre, Matthew H.; Gangestad, Steven W.; Gray, Peter B.; Flynn Chapman, Judith; Burnham, Terence C.; O’Rourke, Mary T.; Thornhill, Randy


Semantic Scholar (semanticscholar.org)