text: 1952 Hartmann was appointed as Director of the Institute of Physical Chemistry at the University of Frankfurt. His research  covered all areas of physical and theoretical chemistry. In his spectroscopic studies he applied all available techniques from x-ray, optical, infrared, microwave, NMR to mass spectrometry.  His investigations of kinetic processes include reactions with peptides, organic radicals as well as studied on the influence of pressure and solvation. In his theoretical work Hartmann emphasis on exact solvable models (model quantum chemistry) rather than  numerical ab initio calculations . His main book „Quantum mechanical theory of  chemical bonding“ ( "Theorie der chemischen Bindung auf quantentheoretischer Grundlage") appeared 1954.  Through his publications and lectures he influenced considerably the development of quantum chemistry in  Germany.