Prior to that, he was a member of the board of directors of the Fraunhofer Institute for Toxicology and Environmental Medicine in Hamburg from 1995 to 2002, and from 1986 to 2001 he worked as a researcher at the Fraunhofer Gesellschaft in Hannover. Hockertz received his first academic training as a graduate biologist in 1985. Founded as a GmbH in Germany in 1994 Prof. Hockertz founded tpi consult as a GmbH in Germany, and the company was founded in Switzerland in 2011. In May 2022 the company was transformed into tpi consult AG.
Prof. Stefan W. Hockertz has been appointed as a "Eurotox Registered Toxicologist" and also holds the designation of Head of Manufacturing and Control according to § 15.1 and §15.3 of the German Medicines Act. Hockertz holds a Dr. rer. nat. in biology from the University of Hanover, a habilitation in medicine for the subjects toxicology and pharmacology, was professor of molecular immunotoxicology at the University Medical Centre Hamburg Eppendorf and is a professor at the University of Hamburg.