# Peter Blau
**Peter Michael Blau** (February 7, 1918 – March 12, 2002) was an Austrian-born American sociologist who did pioneering work in four areas: organizational sociology, social exchange theory, social stratification, and intergroup relations.[1](https://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/blau-peter-m) He was elected to the National Academy of Sciences in 1980[2](https://www.nationalacademies.org/read/11172/chapter/3) and served as the 65th President of the American Sociological Association.[3](https://www.asanet.org/peter-m-blau/) By the end of the twentieth century he was among the most cited of all active sociologists.[2](https://www.nationalacademies.org/read/11172/chapter/3)
*Not to be confused with Peter J. Blau, a tribologist and materials scientist who studies friction, wear, and lubrication.*
| Key facts | |
|---|---|
| Born; died | February 7, 1918, Vienna; March 12, 2002, aged 84[3](https://www.asanet.org/peter-m-blau/) • [4](https://www.nasonline.org/directory-entry/peter-m-blau-79inwn/) |
| Field | Organizational sociology, exchange theory, stratification, intergroup relations[1](https://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/blau-peter-m) |
| Training | BA, Elmhurst College; PhD with Robert K. Merton, Columbia University, 1952[5](https://sk.sagepub.com/ency/edvol/socialtheory/chpt/blau-peter#_) |
| Signature work | *Exchange and Power in Social Life* (1964); *The American Occupational Structure* (1967)[6](https://api.pageplace.de/preview/DT0400.9781351521208_A30937931/preview-9781351521208_A30937931.pdf) • [7](https://eric.ed.gov/?id=ED066526) |
| Honors | NAS member (elected 1980); ASA 65th president; Pitt Professor at Cambridge[2](https://www.nationalacademies.org/read/11172/chapter/3) • [3](https://www.asanet.org/peter-m-blau/) |
| Named after him | "Blau space," the multidimensional mapping of social positions[3](https://www.asanet.org/peter-m-blau/) |
## Early life and education
Blau was born in Vienna on February 7, 1918.[4](https://www.nasonline.org/directory-entry/peter-m-blau-79inwn/) He escaped to the United States during the Second World War and joined the U.S. Army in 1942.[8](https://id.loc.gov/authorities/names/n50009888.html) He took his bachelor's degree in sociology at Elmhurst College and completed his doctorate at Columbia University in 1952, working with [Robert K. Merton](https://www.edgepedia.org/robert-k-merton).[5](https://sk.sagepub.com/ency/edvol/socialtheory/chpt/blau-peter#_) In graduate school, as he later wrote in *A Circuitous Path to Macrostructural Theory*, his orientation changed under the influence of Merton and [Paul Lazarsfeld](https://www.edgepedia.org/paul-lazarsfeld) from grand theories to systematic theory grounded in research; his dissertation was a field study of bureaucracy in terms of [Max Weber](https://www.edgepedia.org/max-weber)'s theory.[9](https://doi.org/10.1146/annurev.soc.21.1.1) (One Library of Congress record notes a variant crediting the PhD to the University of Chicago; the memoir, the ASA obituary, and the Sage encyclopedia all give Columbia in 1952.)[8](https://id.loc.gov/authorities/names/n50009888.html) • [2](https://www.nationalacademies.org/read/11172/chapter/3)
## Career record
After Columbia, Blau taught at [Wayne State University](https://www.edgepedia.org/wayne-state-university) and Cornell University, then became professor at the University of Chicago from 1953 to 1970.[2](https://www.nationalacademies.org/read/11172/chapter/3) • [3](https://www.asanet.org/peter-m-blau/) He moved to Columbia University in 1970 and taught there until his retirement in 1988, with a parallel appointment at SUNY-Albany from 1979 to 1983.[3](https://www.asanet.org/peter-m-blau/) He then taught at the [University of North Carolina at Chapel Hill](https://www.edgepedia.org/university-of-north-carolina-at-chapel-hill) as Robert Broughton Distinguished Research Professor from 1988 to 2001.[3](https://www.asanet.org/peter-m-blau/) He served as Pitt Professor at Cambridge University and taught in Tianjin, China, in 1981 and 1987; the Tianjin Academy of Social Sciences later made him an honorary professor.[3](https://www.asanet.org/peter-m-blau/)
## Representative work
**The Dynamics of Bureaucracy** (1955), built on his dissertation fieldwork, is regarded as a sociological classic.[2](https://www.nationalacademies.org/read/11172/chapter/3) At Chicago he coauthored with W. Richard Scott a 1962 foundational text of organizational sociology and led the Comparative Organization Research Project, which continued after his move to Columbia.[2](https://www.nationalacademies.org/read/11172/chapter/3) His 1970 formal theory of differentiation in organizations, based on data from 53 state employment security agencies, found that differentiation increases with organizational size but at a reduced rate.[5](https://sk.sagepub.com/ency/edvol/socialtheory/chpt/blau-peter#_)
Among his most influential books are *Exchange and Power in Social Life* (1964) and *The American Occupational Structure* (1967).[6](https://api.pageplace.de/preview/DT0400.9781351521208_A30937931/preview-9781351521208_A30937931.pdf) • [7](https://eric.ed.gov/?id=ED066526) His later macrostructural work comprised *Inequality and Heterogeneity* (1977), which lays out three parameters of communities: diversity along multiple dimensions, prevailing inequalities, and whether inequalities cut across or confound group differences; and *Crosscutting Social Circles* (1984), coauthored with Joseph Schwartz, which examined variation within 125 metropolitan communities and its effect on intergroup relations as measured by intermarriage.[1](https://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/blau-peter-m)
## Exchange theory
*Exchange and Power in Social Life* uses the concepts of exchange, reciprocity, imbalance, and power to derive the more complex processes of social structure from simpler ones.[10](https://doi.org/10.2307/2091154) Its principles of reciprocity and imbalance are used to derive power and changes in group structure, and to identify two major forces governing complex social structures: the legitimization of organizing authority of increasing scope, and the emergence of oppositions.[10](https://doi.org/10.2307/2091154) Blau expected the theory to provide a nexus between microsociological and macrosociological analysis.[6](https://api.pageplace.de/preview/DT0400.9781351521208_A30937931/preview-9781351521208_A30937931.pdf)
The book is best known for its disagreement with [George Homans](https://www.edgepedia.org/george-c-homans), who had developed his own exchange theory in 1961 on substantially different assumptions and used Blau's earlier analysis of unofficial consultation as his prototypical illustration of exchange.[9](https://doi.org/10.1146/annurev.soc.21.1.1) Blau's objection was that exchange cannot be reduced to psychological principles governing individual motives: in sociology, both what is explained and what explains are social, and social structures have emergent properties.[6](https://api.pageplace.de/preview/DT0400.9781351521208_A30937931/preview-9781351521208_A30937931.pdf) Where Homans worked at the subinstitutional level with behavioral psychology, Blau moved to the institutional level, dealing with authority, power, conflict, and change, and introduced microeconomic reasoning instead.[11](https://www.encyclopedia.com/social-sciences-and-law/sociology-and-social-reform/sociology-general-terms-and-concepts/social-exchange) Craig Calhoun, a sociologist at [Arizona State University](https://www.edgepedia.org/arizona-state-university), records Randall Collins's description of Blau as "leap-frogging" Homans by developing a full-fledged nonreductionistic exchange theory.[12](https://calhoun.faculty.asu.edu/sites/g/files/litvpz3321/files/publications/articles/28746898260003841.pdf)
## The American Occupational Structure and mobility findings
*The American Occupational Structure* (1967), with [Otis Dudley Duncan](https://www.edgepedia.org/otis-dudley-duncan), developed a new way of studying intergenerational social mobility: how education, occupation, and income determine a person's status relative to their parents'.[1](https://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/blau-peter-m) The data came from the "Occupational Changes in a Generation" survey, carried out as an adjunct to the Census Bureau's monthly [Current Population Survey](https://www.edgepedia.org/current-population-survey), with a representative sample of over 20,000 American men aged 20 to 64.[7](https://eric.ed.gov/?id=ED066526)
After the book's publication, regression and path analysis became widely used in sociological research on mobility and other topics.[9](https://doi.org/10.1146/annurev.soc.21.1.1) The National Academy of Sciences memoir calls it the most influential quantitative study in American sociology and credits it with launching status attainment research.[2](https://www.nationalacademies.org/read/11172/chapter/3)
Two findings stand out. First, mobility was mostly small-step: the analysis of manpower flow among 17 occupations found two class boundaries, between white-collar and blue-collar groups and between blue-collar and farm groups, that limited downward movement to below chance expectation, though not upward movement, a result at odds with the [Horatio Alger](https://www.edgepedia.org/horatio-alger) myth of rags-to-riches ascent.[13](https://doi.org/10.2307/2091338) • [2](https://www.nationalacademies.org/read/11172/chapter/3) Second, the analysis found no vicious circle of poverty for people generally but did find one for Black Americans, who faced cumulative disadvantages at each career step: even with equal education they would get less good jobs, and even in the same occupations their earnings would be lower.[9](https://doi.org/10.1146/annurev.soc.21.1.1)
## Honors and recognition
Blau was elected to the National Academy of Sciences in 1980, in Section 53: Social and Political Sciences.[2](https://www.nationalacademies.org/read/11172/chapter/3) • [4](https://www.nasonline.org/directory-entry/peter-m-blau-79inwn/) He served as the 65th President of the American Sociological Association; his presidential address, "Parameters of Social Structure," was delivered on August 26, 1974, at the Association's Annual Meeting in Montreal and published in the *American Sociological Review*.[3](https://www.asanet.org/peter-m-blau/) (The NAS memoir gives his presidency as 1972–1973; the ASA obituary dates it to 1973 with the 1974 address.)[2](https://www.nationalacademies.org/read/11172/chapter/3) • [3](https://www.asanet.org/peter-m-blau/) His 1974 macrostructural model, which conceptualizes social structure as a multidimensional space of social positions, is known as "Blau space," a term due to Miller McPherson that sociologists still use to illustrate cultural, evolutionary, and institutional effects.[3](https://www.asanet.org/peter-m-blau/) • [5](https://sk.sagepub.com/ency/edvol/socialtheory/chpt/blau-peter#_)
## References
1. "Blau, Peter M." – Encyclopedia.com. https://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/blau-peter-m
2. Scott, W. Richard, and Calhoun, Craig. "Peter Michael Blau." Biographical Memoirs, National Academy of Sciences. https://www.nationalacademies.org/read/11172/chapter/3
3. Blau, Reva. "Peter M. Blau." American Sociological Association, Footnotes obituary, April 2002. https://www.asanet.org/peter-m-blau/
4. "Peter M. Blau." NAS Member Directory. https://www.nasonline.org/directory-entry/peter-m-blau-79inwn/
5. "Blau, Peter." Encyclopedia of Social Theory (Sage). https://sk.sagepub.com/ency/edvol/socialtheory/chpt/blau-peter#_
6. Blau, Peter M. *Exchange and Power in Social Life* (1964), publisher preview. https://api.pageplace.de/preview/DT0400.9781351521208_A30937931/preview-9781351521208_A30937931.pdf
7. *The American Occupational Structure* (1967), ERIC abstract. https://eric.ed.gov/?id=ED066526
8. "Blau, Peter M., 1918–2002." Library of Congress authority record. https://id.loc.gov/authorities/names/n50009888.html
9. Blau, Peter M. "A Circuitous Path to Macrostructural Theory." *Annual Review of Sociology* 21 (1995). https://doi.org/10.1146/annurev.soc.21.1.1
10. Review of *Exchange and Power in Social Life*. https://doi.org/10.2307/2091154
11. "Social Exchange." Encyclopedia.com. https://www.encyclopedia.com/social-sciences-and-law/sociology-and-social-reform/sociology-general-terms-and-concepts/social-exchange
12. Calhoun, Craig. "Introduction: Peter Blau's sociological structuralism." https://calhoun.faculty.asu.edu/sites/g/files/litvpz3321/files/publications/articles/28746898260003841.pdf
13. "The Flow of Occupational Supply and Recruitment." https://doi.org/10.2307/2091338
14. "The Works of Peter M. Blau: Analytical Strategies, Developments and Assumptions." https://doi.org/10.2307/1389495
15. "Salience, Heterogeneity and Consolidation of Parameters: Civilizing Blau's Primitive Theory." https://doi.org/10.2307/2095228
16. "Blau, Peter (1918–2002)." Blackwell Encyclopedia of Sociology. https://doi.org/10.1002/9781405165518.wbeosb031
17. "The Importance of Peter M. Blau's Social Exchange Theory in Society 5.0 Era." SSRN. https://doi.org/10.2139/ssrn.5283551
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*Topic: Encyclopedia › Society and history › Social and behavioral scientists › Sociologists*
*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026; Sep 30, 2026 · Edited: Sep 25, 2026; Oct 11, 2026 · Last review: Sep 30, 2026*
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