Research
Geary’s research interests are centered around his three books, Children's mathematical development (1994), Male, female (1998, 2010, second edition), and Origin of mind (2005), all published by the American Psychological Association. He is also co-author of the 2008 Sex differences: Summarizing more than a century of scientific research, published by Psychology Press.
His research on mathematical development ranged from mathematical modeling of adults’ processing of arithmetic problems ; the effects of aging on these processes; and cross national and cross generational differences in mathematical abilities . In this area, he is best known for his research on learning difficulties in mathematics and in 1993 published a theoretical and review article that outlined subtypes of disabilities and helped to organize subsequent research in this area . He currently directs the Missouri Longitudinal Study of Mathematical Learning and Disability .
Geary’s research in evolutionary psychology also ranges across a variety of issues, from evolution of the hominid brain to men’s hormonal responses while competing against members of their in-group or against an out-group . He has also written extensively on human paternal investment (fatherhood) and the evolution of the human family, and is one of the pioneers in evolutionary developmental psychology and evolutionary educational psychology.
His research group, including graduate students Drew H. Bailey and Benjamin Winegard is currently focused on the study of sex differences in mate preferences and friendship formation and dynamics.
Geary also collaborates with Cheryl Rosenfeld, R. Micheal Roberts and graduate student Eldin Jašarević on studies of the relation between sexual selection and sex differences in vulnerability to prenatal exposure to endocrine disrupting compounds, such as Bisphenol A
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