Thomas Mertens studied Chemistry in Bonn and Medicine in Cologne (1968-1976). He obtained his MD Thesis (Dr. med.) in 1976 and his Habilitation in 1984. Thomas Mertens was a medical assistant, training in internal medicine and surgery (1976–1977); he continued with a research fellowship for postdoctoral training in immunology, virology, and diagnostics, Institute of Virology, University of Cologne (1977–1985). In 1983 he reached the Board Certification in Microbiology and Epidemiology of Infectious Diseases. In 1985 he became Professor (C2) at the Institute of Virology, University of Cologne, from 1991 to 1998 he was Professor (C3), in the Dept. of Virology, Ulm University. He was Temporary Director of the Dept. Medical Hygiene, Ulm University Hospital from 1991 to 1992; and Dean of Studies at the Medical Faculty, Ulm University from 2003 to 2006. Since 1998 he has been the Director of the Institute of Virology at the Ulm University Hospital.