We acknowledge with great dismay and sorrow the death of Em. Professor Jan G. van den Tweel (Fig. 1) on February 14, 2020. Shortly before his death, he attended our Working Group Meeting of the European Society of Pathology (ESP) in Vienna. He gave us a lecture about the importance of Gerard van Swieten—the manuscript of his talk is published in this special issue of the Wiener Medizinische Wochenschrift.

Fig. 1
figure 1

Professor Jan G. van den Tweel

From 1991 to 2003, Prof. van den Tweel was head of the Pathology Department at UMC Utrecht. During his active working life (for overview see the Appendix) he specialized in haematopathology and autopsy pathology. He engaged himself enormously in education and training and played a prominent role in the creation of the new medical curriculum of the University in Utrecht. For many years, Prof. van den Tweel was Chairman of the Examination Committee and Vice Chairman of the day-to-day management of Central Education Committee.

At the European level, he acted as chairman of the examination board of the European Board of Pathology who introduced the European pathology exam. He was President of the European Bone Marrow Working Group, founder and President of the European Association of Pathology Chairs and Residency Program Directors. He published more than 180 articles and supervised many PhD theses. Because of his efforts in the field of education, he was appointed Knight in the Order of Orange-Nassau in 2008, and in 2018 he received the Pompe Medal from the Dutch Association for Pathology.

After his retirement, he focused also on the history of medicine and was for a few years the Chairman of the ESP Working Group of History of Pathology. In this position, he organized several symposia together with the local meeting committees e.g. in Florence (Gabriella Nesi & Raffaella Santi) and Padua (Gaetano Thiene & Fabio Zampieri). In 2017, the volume entitled Pioneers in Pathology (Springer), part of the Encyclopedia of Pathology, was released with Jan van den Tweel as editor. But more than this, as co-editor and author, he published the beautifully illustrated book From Magic to Molecules. For me personally and for many of our colleagues, his passing means the loss of a valued and amiable person, and we will miss him very much. Our condolences go out to his family and close friends.