Grassberger was born in 1972 and studied medicine and biology in Vienna. He lectures at the University of Vienna's Faculty for Natural Science and at the Faculty of Medicine of the Sigmund Freud University in Vienna, covering the fields of human biology, evolutionary medicine, forensic medicine and pathology. Grassberger is the author of numerous published works and practises regenerative ecological horticulture in Lower Austria. Published by Residenz Verlag: Das leise Sterben (2019).