Based on the opposite function:
* Population reducer: This emphasizes the opposite of a demographer's role in studying and analyzing population growth.
* Population controller: This emphasizes the potential for intervention in population trends.
Based on the opposite focus:
* Individualist: This emphasizes a focus on individual experiences rather than population-level trends.
* Sociologist: While sociology and demography overlap, a sociologist might focus on social structures and interactions rather than purely demographic data.
* Historian: This emphasizes a focus on the past rather than the present or future of populations.
More general antonyms:
* Ignorant: This implies a lack of knowledge about population trends.
* Uninformed: This implies a lack of awareness about population dynamics.
Ultimately, the best antonym depends on the specific context and the desired emphasis.