Cornelis Jan Hadde van de Velde, born June 5, 1951, received a PhD (cum laude) in breast cancer in 1977. He trained in Leiden and Houston in surgery and surgical oncology until 1982. He was appointed Professor of Surgery in 1987 at the Leiden University Medical Center.

His major clinical and scientific interest is breast, colorectal, gastric cancer and endocrine tumors. He is past chairman of EORTC Breast Group, Dutch Colorectal Cancer and Gastric Cancer Group, FACS(hon), FRCPS(hon), Past President of the Royal Academy of Sciences of the Netherlands, Past President of European Society of Surgical Oncology, Past President of ECCO – the European Cancer Organization and President of EURECCA (European Registration of Cancer Care).

In 2013 he received the Royal Dutch Honor: the Order of the Netherlands Lion. He has published presently over 900 publications.