An epidemiologist specialises in the investigation of diseases, to stop them from spreading or from recurring, as well as other public health issues.

Epidemiologists focus on investigating, analysing and predicting disease epidemics, such as that caused by the Ebola virus. They then report their findings to the government and to the public.

Epidemiologists frequently work for the government and for universities, as well as research institutions. They collect and analyse data for in-depth research of health issues. Most frequently, epidemiologists focus on infectious diseases, but they can focus on other areas as well, such as cancer and heart disease.