Heiner Cordes, former Chief Engineer of the Institute of Structural Concrete at RWTH Aachen University, passed away at the age of 83 on 6 May 2019, having worked at the Institute of Structural Concrete  at RWTH Aachen University from 1971 to 1998. Due to his outstanding achievements in research and teaching, he was appointed full professor in 1993. He introduced the "Praktikum im Spannbeton" (Practical course in prestressed concrete), which illustrates the most important phenomena of prestressed concrete construction to students. Heiner Cordes has published more than 50 articles in national and international journals, including the expert committee "Prestressing Methods" of the Deutsches Institut für Bautechnik and the committee EN 523 and EN 524 "Sheaths for prestressing tendons". His investigations in his extensive research focus were fundamental for practice and science. We will always remember Heiner Cordes with respect.