Hans Grassmann (Bamberg, 21 May 1960) is a German physicist, writer and entrepreneur, who teaches and works in Italy. Grassmann is the author of four books and more than 250 scientific publications, and is the founder and managing director of the research company Isomorph srl. His main contributions to physics include the development of a (Tl) calorimeter with a photodiode; developing the analysis of asymmetry in the production of the W particle; a contribution to the discovery of the top quark, the development of a physics theory of information; the design and development of a wind turbine with an external duct; and the realization of the linear mirror for the concentration of solar energy. Grassmann has worked in Italy since 1988. Life and work Study of physics From 1979 to 1984, Grassmann studied physics at the University of Erlangen and the University of Hamburg. For his laurea thesis, he developed a detection method for high energy photons using a scintillating crystal (CsI(Tl)) calorimeter with photodiode readout. Advanced scientific experiments make use of this technology, including the Crystal-Barrel, the BaBar, the CLEO, the Belle experiments and the Glast satellite. From 1984 to 1988, Grassmann was part of the UA1 experiment at CERN in Geneva, where he wrote his PhD thesis. From 1987 to 1999, Grassmann worked with the CDF collaboration at the Tevatron collider in the Fermi National Laboratory (Fermilab), close to Chicago and at the Superconducting Super Collider laboratory (Dallas). In 1988 with his student, S. Leone, he developed the study of the asymmetry in production and decay of the W-boson at the Tevatron proton–antiproton collider. W bosons are predominantly produced in collisions of valence quarks; therefore, one can determine the kinematic properties of the up and down quarks in the proton and antiproton from the observation of W production. By analyzing the relative difference in the production of W+ and W− particles, one can substantially reduce the effects of systematic uncertainties in the experimental device. Since 1988, Grassmann has developed a method for detecting the top quark. The method makes use of the different kinematic properties of production and decay of top quark particles and background events, such as the production of W particles together with hadronic jets. In 1994, this analysis was successfully applied by Grassmann, G. Bellettini and M. Cobal. The top quark was observed in Tevatron collider data. These results were confirmed when the analysis was