1909 – He was born on the 15th of July in The Hague, Netherlands.
1931 – He studied theoretical physics at the University of Leiden under Paul Ehrenfest, where he received his Ph.D.
1938 – He became a physics professor at Leiden University.
1942 – During World War II, Casimir moved to the Philips Research Laboratories in Eindhoven, the Netherlands.
1945 – He remained an active scientist and wrote a well-known paper on Lars Onsager’s principle of microscopic reversibility.
1946-1956 – He became a co-director of Philips Research Laboratories laboratories and a member of the board of directors of the company.
1972 – He retired from Philips.
2000 – He died on the 4th of May in Heeze.