Peter Turchin. Peter Valentinovich Turchin (; ; born 22 May 1957) is a Russian-American complexity scientist, specializing 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, anthropology, 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.

Early life and education 
Peter Turchin was born in 1957 in Obninsk, Russia, 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. (cum laude) in biology from New York University, and in 1985 a Ph.D. in zoology from Duke University. However, he holds no degrees in history and is not a trained historian.

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 cycles 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".

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). Furthermore, they have 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.

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, "...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
 Elite overproduction
 Structural-demographic theory
 Seshat (project)

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.

1957 births
American evolutionary biologists
World system scholars
Complex systems scientists
Living people
New York University alumni
Duke University alumni
Fellows of the American Association for the Advancement of Science
University of Connecticut faculty
Writers from Moscow
Soviet emigrants to the United States
Russian scientists