Geoffrey F. Miller (born 1965 in Cincinnati, Ohio) is an American evolutionary psychologist, serving as an associate professor of psychology at the University of New Mexico and known for his expertise in sexual selection in human evolution, and for his views on the evolution through sexual selection of the human brain as sexual ornamentation.
In 1987, Miller graduated from Columbia University, where he earned a BA in biology and psychology. He received his PhD in cognitive psychology from Stanford University in 1993 under the guidance of Roger Shepard.
Miller held positions as a postdoctoral researcher in the evolutionary and adaptive systems group in the School of Cognitive and Computing Sciences at the University of Sussex (1992–94); lecturer in the department of psychology at the University of Nottingham (1995), both in England; research scientist at the Center for Adaptive Behavior and Cognition at the Max Planck Institute for Psychological Research, Munich, Germany (1995–96); and senior research fellow at the Centre for Economic Learning and Social Evolution, University College London, England, (1996–2000). He has worked at the University of New Mexico since 2001, where he is now associate professor. In 2009, he was visiting scientist at the Genetic Epidemiology Group, Queensland Institute of Medical Research, Australia.