Herman van Wietmarschen, Ph. D. (University of Leiden, systems biology) is researcher Integrative Medicine at the non-profit research institute Louis Bolk Institute in the Netherlands, board member of the Academy of Integrative Medicine and associate editor for the European Journal of Integrative Medicine. He is conducting fundamental research into the working mechanisms of whole medical systems using systems biology technologies such as metabolomics. Additionally he is conducting pragmatic implementation research in the area of integrative medicine, helping health care organisations implementing complementary medicine and evaluating the process and effects. His drive is to understand the interactions between biological, psychological, social and spiritual aspects of health in various health cultures as well as translating this understanding into practice.