Gilles is an attending physician at the Department of Infectious Diseases, University Hospital Bern and a senior research fellow. He currently leads several HIV and viral hepatitis cohort projects within the framework of IeDEA-SA and IeDEA-West Africa as well as in the Swiss HIV Cohort Study. He has recently been granted a three-year Ambizione-Prosper fellowship from the Swiss National Science Foundation to study HIV and Hepatitis B coinfection in sub-Saharan Africa.