He wrote his diploma thesis at the Institute for Physical Chemistry and Electrochemistry with Günter Scheibe.
There he received his doctorate in 1962 with the title, Anwendung der erweiterten π-Elektronentheorie nach Hartmann-Ruch auf ungesättigte Kohlenwasserstoffe und Farbstoffe.
[citation needed] Hohlneicher's main research interests lie in (1) the determination of the geometry of molecules in different electronic states.
Use of ab initio, semiempirical and DFT methods; (2) Theoretical studies of excited electronic states of medium-sized organic molecules.
Spectra simulation on an ab-initio and semi-empirical level; (3) Quantum dynamic analysis of molecular systems.