under Heike Kamerlingh Onnes and Hendrik Antoon Lorentz. After obtaining his Ph.D. degree in 1908 he married Tettje Clay-Jolles with whom he had a son.

Career

After teaching in Leiden and at the Technische Hogeschool in Delft from 1906 to 1920, he was appointed Professor at the newly founded Bandung Institute of Technology.