On the occasion of the decease of Prof. Jan Vanhellemont, a brief overview of his scientific career, covering more than 35 years in semiconductor materials science, is given in this paper. The main scientific highlights are summarized. Besides the different positions he has taken in his career at different universities and companies, he has also been very active in establishing a world‐wide network of collaborations and contacts, who often became also good friends. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)