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 I graduated in zoology from the University of Liège (ULg) in September 1971 and started in 1972 a doctoral thesis analyzing the endocrine controls of reproductive behavior in male domestic mallards. I obtained a PhD degree from the ULg in 1977 and spent a post-doctoral year at Rutgers University, Newark NJ under the supervsion of Mei-Fang Cheng and Harvey Feder. After returning to the ULg, I created the Research Group in Behavioral Neuroendocrinology that I directed until my retirement in September 2014. This group focussed on the analysis of the neuroendocrine mechanisms controlling the activation and sexual differention of reproductive behavior using mainly birds (quail and songbirds) as models. Recently, my work on sexual diferentiation of behavior developped into an interest for the biological bases of sexual orientation in animals and humans (homo- vs. hetero-sexuality) and a wrote a few books on the topic.

     The research group in Behavioral Neuroendocrinology remains fully active under the direction of Dr. Charlotte Cornil and its official site can be found at

 I still work as research associate/consultant in this research group that has now been merged with the Neuroendocrinology Unit of the GIGA Neurosciences.

This web site presents:

  • The current organization of the research group in Behavioral Neuroendocrinology
  • Its  the history of the research group and major achievements
  • Its current research projects
  • My current scientific activities and interests
  • An overview of my publications and conferences on the biological bases human homosexuality


© Jacques Balthazart 2019