Peter Valentinovich Turchin ( ; born 22 May 1957) is a Russian-American scientist who specializes in an area of study he and his colleagues developed called cliodynamics—mathematical modeling and statistical analysis of the dynamics of historical societies.

Turchin is an emeritus professor at the University of Connecticut in the departments of ecology and evolutionary biology and mathematics. He is a project leader at the Complexity Science Hub Vienna and a research associate at the School of Anthropology of the University of Oxford.

He was editor-in-chief and remains a member of the editorial board at Cliodynamics: The Journal of Quantitative History and Cultural Evolution. Turchin is a founding director of the Seshat: Global History Databank. He was a director of the Evolution Institute. In 2021, he was elected a fellow of the American Association for the Advancement of Science (FAAAS).

Early life and education Peter Turchin was born in 1957 in Obninsk, Russian SFSR, and in 1964 he moved with his family to Moscow. In 1975 he enrolled at Moscow State University's Faculty of Biology and studied there until 1977, when his father, Soviet dissident Valentin Turchin, was exiled from the Soviet Union. In 1980 Turchin received a B.A. degree (cum laude) in biology from New York University, and in 1985 a Ph.D. in zoology from Duke University. While Turchin's training is as a theoretical biologist, he holds no degrees in history.

Career

Throughout his career Turchin has made contributions to various fields, such as economic history and historical dynamics. He is one of the founders of cliodynamics, the scientific discipline at the intersection of historical macrosociology, cliometrics, and mathematical modeling of social processes. Turchin developed an original theory explaining how large historical empires evolve by the mechanism of multilevel selection. His research on secular cyclesTurchin P. and Korotayev A. 2006. Population Dynamics and Internal Warfare: A Reconsideration. Social Evolution & History 5(2): 112–147; Turchin P. and Nefedov S. 2009. Secular Cycles. Princeton University Press. has contributed to our understanding of the collapse of complex societies as has his re-interpretation of Ibn Khaldun's notion of asabiyya as "collective solidarity"..Korotayev A.V., Khaltourina D.A. Introduction to Social Macrodynamics: Secular Cycles and Millennial Trends in Africa. Moscow: URSS, 2006. .

One of Turchin's most prominent fields of research is his study of the hypothesis that population pressure causes increased warfare. Turchin, in collaboration with Korotayev, has shown that negative results do not falsify the population-warfare hypothesis. Population and warfare are dynamical variables. If their interaction causes sustained oscillations, then we do not in general expect to find strong correlation between the two variables measured at the same time (that is, unlagged). Turchin and Korotayev have explored mathematically what the dynamical patterns of interaction between population and warfare (focusing on internal warfare) might be in stateless and state societies.

Next, they tested the model predictions in several empirical case studies: early modern England, Han and Tang China, and the Roman Empire. Their empirical results have lent support to the population-warfare theory: Turchin and Korotayev have found that there is a tendency for population numbers and internal warfare intensity to oscillate with the same period but shifted in phase, with warfare peaks following population peaks. They demonstrated that the rates of change of the two variables behave precisely as predicted by the theory: population rate of change is negatively affected by warfare intensity, while warfare rate of change is positively affected by population density.

In 2010, Turchin published research using 40 combined social indicators to predict that there would be worldwide social unrest in the 2020s. He subsequently cited the success of Donald Trump's 2016 presidential campaign as evidence that "negative trends seem to be accelerating" and that there has been an "unprecedented collapse of social norms governing civilized discourse". In 2020, Turchin and Jack Goldstone predicted that political and civic unrest in the United States would continue regardless of the party in power, until a leader took action to reduce inequality and improve the social indicators that are tracked in their research.

Elite overproduction Elite overproduction is a concept developed by Peter Turchin that describes the condition of a society that has an excess supply of potential elite members relative to its ability to absorb them into the power structure. This, he hypothesizes, is a cause for social instability, as those left out of power feel aggrieved by their relatively low socioeconomic status.

Turchin first described his theory in a 2010 letter to Nature. In it he stated, "The next decade is likely to be a period of growing instability in the United States and western Europe." Turchin likened this to "a forest in which deadwood has been accumulating for many years. We don’t know what will start the fire – it could be a lightning strike during a storm, or a careless match thrown away. But sooner or later such a precipitating spark will arrive, and there will be a massive conflagration."

In Ages of Discord, Turchin offered historical examples of both violent and non-violent ends of elite overproduction. The Progressive Era, New Deal, and continuing with the decades following World War II in the United States were, according to Turchin, a notably non-violent resolution in the United States of this problem achieved by a ruling class who had learned from previous calamity that mitigating economic inequality was what was required to forestall crisis.

According to Turchin and Jack Goldstone, periods of political instability have throughout human history been due to the purely self-interested behavior of the elite. They state that when the economy faced an expansion in the workforce, exerting a downward pressure on wages, the elite generally kept much of the wealth generated to themselves, resisting taxation and income redistribution. Thus, according to Turchin and Goldstone, in the face of intensifying competition, they also sought to restrict upward mobility to preserve their power and status for their descendants. They hypothesize that these actions exacerbate inequality, therefore driving sociopolitical turbulence.

Works Turchin has published over 200 scientific articles, including more than a dozen in Nature, Science, or PNAS, and at least eight books. He is the founder of the journal, Cliodynamics: The Journal of Quantitative History and Cultural Evolution, "...dedicated to 'the search for general principles explaining the functioning and dynamics of historical societies'", and manages a blog, Cliodynamica.

Books

.

Selected journal articles

Turchin P. (2006). Population Dynamics and Internal Warfare: A Reconsideration. Social Evolution & History 5(2): 112–147 (with Andrey Korotayev).

(Article retracted on July 7, 2021) Explaining the rise of moralizing religions: A test of competing hypotheses using the Seshat Databank. Religion, Brain & Behavior, 2023, 13(2), 167-194.

See also

Historic recurrence Seshat (project) Structural-demographic theory Power struggle Credentialism Managerial class Toynbee's theory of social decay Capital in the Twenty-First Century Brahmin Left Joseph Tainter

References

Further reading Article on work by Goldstone and Turchin.

Turchin adopted and expanded Goldstone's model to apply to modern industrial states. They later became collaborators. Osnos, Evan, "Ruling-Class Rules: How to thrive in the power elite – while declaring it your enemy", The New Yorker, 29 January 2024, pp. 18–23. "In the nineteen-twenties... American elites, some of whom feared a Bolshevik revolution, consented to reform... Under Franklin D. Roosevelt... the U.S. raised taxes, took steps to protect unions, and established a minimum wage. The costs, Turchin writes, 'were borne by the American ruling class.'... Between the nineteen-thirties and the nineteen-seventies, a period that scholars call the Great Compression, economic equality narrowed, except among Black Americans... But by the nineteen-eighties the Great Compression was over. As the rich grew richer than ever, they sought to turn their money into political power; spending on politics soared." (p. 22.) "[N]o democracy can function well if people are unwilling to lose power – if a generation of leaders... becomes so entrenched that it ages into gerontocracy; if one of two major parties denies the arithmetic of elections; if a cohort of the ruling class loses status that it once enjoyed and sets out to salvage it." (p. 23.)

External links

Cliodynamica A Blog about the Evolution of Civilizations @PeterTurchin.com

Maini, Alessandro. "On Historical Dynamics by P. Turchin". Biophysical Economics and Sustainability 5, No. 1 (4 February 2020): 3. DOI: 10.1007/s41247-019-0063-x.