His primary research area is theoretical computer science with an emphasis on graph transformation, algebraic specification, and syntactic picture processing.
Hans-Jörg Kreowski studied mathematics from 1969 to 1974 at Technische Universität Berlin in Germany with a scholarship of Studienstiftung des deutschen Volkes.
There, along with colleagues such as Frieder Nake, Wolfgang Coy, Klaus-Peter Löhr and Hermann Gehring, he significantly shaped the development of the computer science department.
[3] Kreowski has authored over 160 scientific publications with fundamental contributions to the theory and applications of graph transformation, syntactic picture generation, and algebraic specification.
[6][7] The edited books span his main research areas and such diverse topics as computer science and society, logistics, and formal methods in software and systems modeling.