Autor: Alexander Ollongren

Alexander Ollongren began his career as a mathematical astronomer at the Dept. of Astronomy at Leiden University in the Netherlands, where he obtained his Ph D. He then left the university and worked almost two years in Celestial Mechanics at Yale University in the US. Ollongren returned to Holland and became director of the newly established computer center of Leiden University. He spent a sabbatical leave as a visiting scientist at the IBM Laboratory in Vienna and was later appointed full professor of theoretical computer science at the Dept. of Computer Science of Leiden University. He was a guest professor in the same science for about a year at Linkoping University in Sweden. After retirement he became a member of the Permanent Study Group Search for Extra Terrestrial Intelligence (PSGSETI) of the International Astronautical Academy. He has written books and articles on the semantics of programming languages.