The IISH research group consists of a dozen senior researchers, supplemented by a varying number of postdoctoral researchers and PhD students. In addition, the IISH hosts fellows, honorary fellows and guest researchers. All in all, the research group consists of 30-40 researchers.
Since 2020, the research group is led by Professor Karin Hofmeester. A number of senior researchers also have an appointment as a professor at a university, usually for one day a week.