This thesis described my experience in the Master of Philosophy (Applied Epidemiology) (MAE) program between February 2023 – October 2024, during which I was placed with two public health agencies within the Northern Territory (NT) Department of Health: the Centre for Disease Control (CDC) and Health Statistics and Informatics (HSI). My work with the CDC included a retrospective cohort study of Coronavirus disease 2019 (COVID-19) vaccine effectiveness against COVID-19 severe disease (hospitalisation and/or death) in the NT, an evaluation of the NT Notifiable Diseases System, an investigation of a gastroenteritis outbreak, publications on the epidemiology of COVID-19 and influenza, posters advising on cleaning to prevent scabies, and many other public health activities. At HSI, I conducted a retrospective time-series study of alcohol-related injury hospitalisations in the NT in relation to alcohol policy changes between 2007-2022, prepared ministerial briefs, and engaged in statistical teaching activities. I presented two major projects at national public health conferences and one major project at the NT CDC conference. The projects and public health activities I completed fulfilled the requirements of the MAE degree at the Australian National University.