Dijkstra worked as a programmer at the Mathematisch Centrum (mathematics center) in the 1950s. He was responsible for most of the systems programming of three s

Dijkstra worked as a programmer at the Mathematisch Centrum (mathematics center) in the 1950s. He was responsible for most of the systems programming of three subsequent machines that were build and used there. His PhD dissertation (1959) was on the operating system he wrote for the Electrologica X1 computer that was being built by the first Dutch computer industry Electrologica.