Robin Dunbar

Robin Ian MacDonald Dunbar (born 28 June 1947) is a British biological anthropologist and evolutionary psychologist renowned for developing the social brain hypothesis and Dunbar's number , concepts that link neocortex size in primates to the complexity and size of social groups. Dunbar's work posits that the human brain imposes a cognitive limit on the number of meaningful social relationships an individual can sustain, estimated at approximately 150 for stable, multilayered networks. His research integrates behavioral ecology , neuroscience , and anthropology to explain the evolution of human sociality, cognition, and bonding mechanisms.

Born in Liverpool to an engineer father, Dunbar spent much of his early life in East Africa , which influenced his interest in primate behavior. He was educated at Magdalen College School in Brackley , followed by a degree in Psychology and Philosophy (PPP) from Magdalen College, Oxford , in 1969, and a PhD in the behavioral ecology of primates from the University of Bristol . His doctoral research focused on primate social dynamics, laying the foundation for his later theories on brain evolution and group size constraints.

Dunbar's academic career spans multiple institutions, beginning with a Science and Engineering Research Council Advanced Research Fellowship at the University of Cambridge , followed by positions in zoology at Stockholm University , anthropology at University College London , and psychology and biology at the University of Liverpool . In 2007, he joined the University of Oxford as Professor of Evolutionary Psychology , where he directed the Social and Evolutionary Neuroscience Research Group until his retirement in 2017, after which he became Emeritus Professor. His studies employ methods such as neuroimaging , neuroendocrinology (focusing on endorphins in bonding), network analysis, and comparative primatology to investigate how social complexity drives brain evolution and how modern technologies like social media affect human relationships.

Dunbar has authored over 700 publications, including highly cited works like Grooming, Gossip, and the Evolution of Language (1996), which explores language as a mechanism for social bonding, including gender differences in which women often serve as "social glue" by using gossip and conversation to maintain social bonds and group cohesion, in contrast to men's tendency to bond through shared activities, and Friends: Understanding the Power of Our Most Important Relationships (2021). His contributions have earned him prestigious honors, including the Huxley Memorial Medal from the Royal Anthropological Institute in 2015 for services to anthropology , election as a Fellow of the British Academy (FBA) in 1998, Fellow of the Royal Anthropological Institute (FRAI), and Foreign Member of the Finnish Academy of Science and Letters in 2021.

Robin Ian MacDonald Dunbar was born on 28 June 1947 in Liverpool, England, the son of an engineer.[https://gustavus.edu/events/nobelconference/2008/dunbar.php] Shortly after his birth, his family relocated to Kalgoorlie, Australia, and later to East Africa, where he spent much of his childhood.[https://gustavus.edu/events/nobelconference/2008/dunbar.php][https://humanists.uk/about/our-people/patrons/robin-dunbar/] At age 12, he returned to Britain for schooling in Northamptonshire.[https://gustavus.edu/events/nobelconference/2008/dunbar.php]

Dunbar attended Magdalen College School in Brackley, Northamptonshire, for his secondary education.[https://www.magd.ox.ac.uk/people/professor-robin-dunbar/][https://www.theguardian.com/science/2003/may/15/scienceinterviews.academicexperts] He then pursued undergraduate studies at Magdalen College, Oxford , where he read Psychology, Philosophy, and Physiology (PPP), graduating with a B.Sc. in 1969.[https://www.magd.ox.ac.uk/people/professor-robin-dunbar/][https://gustavus.edu/events/nobelconference/2008/dunbar.