1909 – He was born on the 15th day of July this year in The Hague.
1928 – He studied physics at Leiden beginning this year and received his Ph.D.
1938 – He became a physics professor at Leiden University.
1942 – He remained an active scientist.
1945 – He wrote a well-known paper on Lars Onsager's principle of microscopic reversibility.
1956 – He became one of the members of the board of directors of the company this year.
1972 - He retired from Philips this year.
1979 - He was one of the key speakers at CERN's 25th anniversary celebrations.
2000 – He died on the 4th day of May this year in Heeze, the Netherlands.
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