Demographer (noun)

1. A specialist in the study of demographics, the characteristics of human populations, such as size, growth, density, distribution, and vital statistics.
2. An expert in analyzing population statistics and trends.

Origin:

Late 19th century: from french démographe, from greek demos "people" + -graphe "-writer".

Examples:

1. The demographer predicted that the population of the city would double in the next ten years.
2. The demographer's report showed that the country had a rapidly aging population.
3. The demographer presented a detailed analysis of the birth and death rates in different regions of the world.
4. The demographer's research helped the government plan for the future needs of the population.
5. The demographer discussed the impact of migration on population growth and distribution.