The authors present biographies of 3,363 nationals of 99 countries. Biographies are given not only of demographers per se but of those in the social, biological, and physical sciences who have used their expertise to analyze population phenomena, as well as statesmen and men of letters who helped shape ideas or laws on the optimum population, the regulation of immigration, the legitimacy of birth control or abortion, and other beliefs or attitudes related to population. Each entry gives the subject's name, sex, birth and death dates, nationality, principal career positions, and professional publications, ending with one or more references to sources of additional information. An appendix classifies the entries by nationality, and the very full index allows the researcher to follow every person, country, or major topic of demographic analysis through the whole dictionary.