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Robert Ludlow "Bob" Trivers (; born February 19, 1943) is an American
evolutionary biologist Evolutionary biology is the subfield of biology that studies the evolutionary processes such as natural selection, common descent, and speciation that produced the diversity of life on Earth. In the 1930s, the discipline of evolutionary biol ...
and sociobiologist. Trivers proposed the theories of
reciprocal altruism In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar m ...
(1971),
parental investment Parental investment, in evolutionary biology and evolutionary psychology, is any parental expenditure (e.g. time, energy, resources) that benefits offspring.Clutton-Brock, T.H. 1991. ''The Evolution of Parental Care''. Princeton, NJ: Princeton ...
(1972), facultative
sex ratio A sex ratio is the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically about 1:1 in species which reproduce sexually. However, many species deviate from an even sex ratio, ei ...
determination (1973), and
parent–offspring conflict Parent–offspring conflict (POC) is an expression coined in 1974 by Robert Trivers. It is used to describe the evolutionary conflict arising from differences in optimal parental investment (PI) in an offspring from the standpoint of the parent an ...
(1974). He has also contributed by explaining
self-deception Self-deception or self-delusion is a process of denying or rationalizing away the relevance, significance, or importance of opposing evidence and logical argument. Self-deception involves convincing oneself of a truth (or lack of truth) so th ...
as an adaptive evolutionary strategy (first described in 1976) and discussing intragenomic conflict.


Education

Trivers studied evolutionary theory with
Ernst Mayr Ernst Walter Mayr ( ; ; 5 July 1904 – 3 February 2005) was a German-American evolutionary biologist. He was also a renowned Taxonomy (biology), taxonomist, tropical explorer, ornithologist, Philosophy of biology, philosopher of biology, and ...
and William Drury at Harvard from 1968 to 1972, when he earned his
PhD A Doctor of Philosophy (PhD, DPhil; or ) is a terminal degree that usually denotes the highest level of academic achievement in a given discipline and is awarded following a course of graduate study and original research. The name of the deg ...
in
biology Biology is the scientific study of life and living organisms. It is a broad natural science that encompasses a wide range of fields and unifying principles that explain the structure, function, growth, History of life, origin, evolution, and ...
. At Harvard he published a series of some of the most influential and highly cited papers in evolutionary biology. His first major paper as a graduate student was "The evolution of reciprocal altruism", published in 1971. In this paper Trivers offers a solution to the longstanding problem of cooperation among unrelated individuals and by doing so overcame a crucial problem for how to police the system by proposing how natural selection could evolve ways to detect cheaters. His next major work, "Parental investment and sexual selection", was published the following year. Here Trivers proposed a general framework for understanding sexual selection that had eluded evolutionary thinkers since
Charles Darwin Charles Robert Darwin ( ; 12 February 1809 – 19 April 1882) was an English Natural history#Before 1900, naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all speci ...
. Arguably his most important paper, it arose from watching male and female pigeons out the window of his third floor apartment in
Cambridge, Massachusetts Cambridge ( ) is a city in Middlesex County, Massachusetts, United States. It is a suburb in the Greater Boston metropolitan area, located directly across the Charles River from Boston. The city's population as of the 2020 United States census, ...
, and by his reading a 1948 paper by Angus Bateman (“Intra-sexual selection in ''
Drosophila ''Drosophila'' (), from Ancient Greek δρόσος (''drósos''), meaning "dew", and φίλος (''phílos''), meaning "loving", is a genus of fly, belonging to the family Drosophilidae, whose members are often called "small fruit flies" or p ...
''”) which demonstrated that sex differences in the intensity of selection in fruit flies were based on their ability to obtain mates. The primary insight of Trivers was that the key variable underlying the evolution of sex differences across species was relative parental investment in offspring.


Career and research

Trivers was on the faculty at
Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...
from 1973 to 1978, and then moved to the
University of California, Santa Cruz The University of California, Santa Cruz (UC Santa Cruz or UCSC) is a public university, public Land-grant university, land-grant research university in Santa Cruz, California, United States. It is one of the ten campuses in the University of C ...
where he was a faculty member 1978 to 1994. He is a
Rutgers University Rutgers University ( ), officially Rutgers, The State University of New Jersey, is a Public university, public land-grant research university consisting of three campuses in New Jersey. Chartered in 1766, Rutgers was originally called Queen's C ...
faculty member. In the 2008–09 academic year, he was a Fellow at the Berlin Institute for Advanced Study. Trivers was awarded the 2007
Crafoord Prize The Crafoord Prize () is an annual science prize established in 1980 by Holger Crafoord, a Swedish industrialist, and his wife Anna-Greta Crafoord following a donation to the Royal Swedish Academy of Sciences. It is awarded jointly by the Acade ...
in Biosciences for "his fundamental analysis of social evolution, conflict and cooperation". Trivers met
Huey P. Newton Huey Percy Newton (February 17, 1942 – August 22, 1989) was an African American revolutionary and political activist who co-founded the Black Panther Party in 1966. He ran the party as its first leader and crafted its ten-point manifesto with ...
, Chairman of the
Black Panther Party The Black Panther Party (originally the Black Panther Party for Self-Defense) was a Marxism–Leninism, Marxist–Leninist and Black Power movement, black power political organization founded by college students Bobby Seale and Huey P. Newto ...
, in 1978 when Newton applied while in prison to do a reading course with Trivers as part of a graduate degree in History of Consciousness at
UC Santa Cruz The University of California, Santa Cruz (UC Santa Cruz or UCSC) is a public land-grant research university in Santa Cruz, California, United States. It is one of the ten campuses in the University of California system. Located in Monterey Bay ...
. Trivers and Newton became close friends: Newton was godfather to one of Trivers's daughters. Trivers joined the Black Panther Party in 1979. He and Newton published an analysis of the role of
self-deception Self-deception or self-delusion is a process of denying or rationalizing away the relevance, significance, or importance of opposing evidence and logical argument. Self-deception involves convincing oneself of a truth (or lack of truth) so th ...
by the flight crew in the crash of
Air Florida Flight 90 Air Florida Flight 90 was a scheduled domestic passenger flight operated from Washington National Airport (now Ronald Reagan Washington National Airport) to Fort Lauderdale–Hollywood International Airport, with an intermediate stopover at T ...
. Trivers was "ex-communicated" from the Panthers by Newton in 1982 for "his own good."


Suspension

In 2015, Rutgers University suspended Trivers with pay as part of an ongoing dispute regarding a class on "Human Aggression" the Anthropology department had assigned to him. Trivers said that he was told to teach the class even though he objected that he knew nothing about the specific subject. In his first lecture, Trivers told the class he would do his best to learn the subject along with them and with the help of guest lecturers. Rutgers suspended Trivers for involving the students in the controversy. Trivers told the Rutgers campus newsletter that Rutgers's officials refused to meet with him. Trivers also told the student paper: "You would think the university would show a little respect for my teaching abilities on subjects that I know about and not force me to teach a course on a subject that I do not at all master." Trivers has had a contentious few years at Rutgers.


Influence

Trivers is among the most influential
evolutionary theorist Evolution is the change in the heritable Phenotypic trait, characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, re ...
s alive today.
Steven Pinker Steven Arthur Pinker (born September 18, 1954) is a Canadian-American cognitive psychology, cognitive psychologist, psycholinguistics, psycholinguist, popular science author, and public intellectual. He is an advocate of evolutionary psycholo ...
considers Trivers to be "one of the great thinkers in the history of Western thought", who has:
...inspired an astonishing amount of research and commentary in psychology and biology—the fields of sociobiology, evolutionary psychology, Darwinian social science, and behavioral ecology are in large part attempt to test and flesh out Trivers's ideas. It is no coincidence that
E. O. Wilson Edward Osborne Wilson (June 10, 1929 – December 26, 2021) was an American biologist, naturalist, ecologist, and entomologist known for developing the field of sociobiology. Born in Alabama, Wilson found an early interest in nature and frequ ...
's ''
Sociobiology Sociobiology is a field of biology that aims to explain social behavior in terms of evolution. It draws from disciplines including psychology, ethology, anthropology, evolution, zoology, archaeology, and population genetics. Within the study of ...
'' and
Richard Dawkins Richard Dawkins (born 26 March 1941) is a British evolutionary biology, evolutionary biologist, zoologist, science communicator and author. He is an Oxford fellow, emeritus fellow of New College, Oxford, and was Simonyi Professor for the Publ ...
' ''
The Selfish Gene ''The Selfish Gene'' is a 1976 book on evolution by ethologist Richard Dawkins that promotes the gene-centred view of evolution, as opposed to views focused on the organism and the group. The book builds upon the thesis of George C. Willia ...
'' were published in 1975 and 1976 respectively, just a few years after Trivers's seminal papers. Both bestselling authors openly acknowledged that they were popularizing Trivers's ideas and the research they spawned. Likewise for the much-talked-about books on evolutionary psychology in the 1990s—''
The Adapted Mind ''The Adapted Mind: Evolutionary Psychology and the Generation of Culture'' is a 1992 book edited by the anthropologists Jerome H. Barkow and John Tooby and the psychologist Leda Cosmides. First published by Oxford University Press, it is w ...
'', '' The Red Queen'', '' Born to Rebel'', '' The Origins of Virtue'', '' The Moral Animal'', and my own '' How the Mind Works''. Each of these books is based in large part on Trivers's ideas and the explosion of research they inspired, involving dozens of animal species, mathematical and computer modeling, and human social and cognitive psychology.


Significant papers

* * Trivers, R. L. (1972)
''Parental investment and sexual selection.''
In B. Campbell (Ed.) ''Sexual selection and the descent of man'', 1871-1971 (pp 136–179). Chicago, Aldine. * * * * Trivers, R. L. (1991). Deceit and self-deception: The relationship between communication and consciousness. In: M. Robinson and L. Tiger (eds.) ''Man and Beast Revisited,'' Smithsonian, Washington, DC, pp. 175–191.


Books

* Trivers, R. L. (1985) ''Social Evolution''. Benjamin/Cummings, Menlo Park, CA. * Trivers, R. L. (2002) ''Natural Selection and Social Theory: Selected Papers of Robert L. Trivers. (Evolution and Cognition Series)'' Oxford University Press, Oxford. * Burt, A. & Trivers, R. L. (2006) ''Genes in Conflict : The Biology of Selfish Genetic Elements.''
Belknap Press Harvard University Press (HUP) is an academic publishing house established on January 13, 1913, as a division of Harvard University. It is a member of the Association of University Presses. Its director since 2017 is George Andreou. The pres ...
, Harvard. * Trivers R, Palestis BG, Zaatari D. (2009) ''The Anatomy of a Fraud: Symmetry and Dance'' TPZ Publishers * Trivers R (2011) '' The Folly of Fools: The Logic of Deceit and Self-Deception in Human Life''
Basic Books Basic Books is a book publisher founded in 1950 and located in New York City, now an imprint of Hachette Book Group. It publishes books in the fields of psychology, philosophy, economics, science, politics, sociology, current affairs, and his ...
* Trivers R (2015) ''Wild Life: Adventures of an Evolutionary Biologist.'' Plympton.


Personal life

Trivers has two Jamaican ex-wives, five children, and eight grandchildren as of 2016.


Views

Trivers believes that girls mature earlier than in the past. He writes “By the time they’re 14 or 15, they’re like grown women were 60 years ago".


References

{{DEFAULTSORT:Trivers, Robert 1943 births Living people American evolutionary biologists Evolutionary psychologists Human evolution theorists Harvard University alumni Harvard University faculty University of California, Santa Cruz faculty Rutgers University faculty Fellows of the American Association for the Advancement of Science Members of the Black Panther Party Activists from California Sociobiologists