Celebrating 100 Years of Advancing Epidemiology: A Century of Impactful Research.

The author reflects on the "American Journal of Epidemiology's" (AJE) 100-year advancement of epidemiology in 2023. Topics covered include historical material like the commentaries on crossing birth-weight-specific mortality curves, on causal knowledge as a prerequisite for all epidemiology, and on total energy intake with updated implications for epidemiologic analyses. Also noted is the AJE's hosting of a centennial symposium featuring epidemiology practitioners.