We have learned that as of March 15, 2005 our former staff member, friend and colleague

Jop Frederik Sibeijn
Professor of Computer Science
at the Martin-Luther Universität
in Halle-Wittenberg (D)
is missing. It is feared that he has met with a fatal accident.

Jop was born in 1962 in Abcoude (NL). After visiting the Vossius Gymnasium in Amsterdam (1975-1981), Jop studied Physics, Mathematics and Computer Science at Utrecht University. He did his MSc thesis (in Dutch) in Mathematics in 1987 on a topic in Algebraic Topology, under supervision of Dirk Siersma.

After studying Arabic for one year at the Department of Eastern Languages and Cultures, he became a PhD student at the Department of Computer Science of Utrecht University and started his long-lasting interest in parallel computers and computations under supervision of Marinus Veldhorst and Jan van Leeuwen. Jop defended his PhD thesis entitled Algorithms for Routing on Meshes, on December 2, 1992.

From 1992 to 2000, Jop was a full-time researcher at the Max-Planck-Institut für Informatik in Saarbrücken, in the Algorithms and Complexity Group headed by Kurt Mehlhorn. In 1999 he got his "habilitation" in Computer Science from the Universität des Saarlandes.

From october 2000 to april 2002 Jop was a Senior Lecturer at the Computing Science Department of Umeå Universitet. In 2002, Jop moved to Halle to become a Professor of Informatik at the Department of Mathematics and Computer Science of the Martin-Luther-Universität Halle-Wittenberg.

Jop was well-known and liked among all his research colleagues. He published close to 70 papers on efficient algorithms for meshes, routing in networks of processors and most recently, on external memory algorithms. Many of his papers were accepted at conferences like ESA, ICALP, MFCS and SWAT. In 2003, Jop organized the 10th Int'l Colloquium on Structural Information Complexity (SIROCCO'2003), in Umeå.

Jop liked bicycling, including many trips of several thousands of kilometers through Europe and Northern Africa including the Sahara, some with his former buddies like Jeroen Fokker, and many with his wife Petra. Since 1997 he took up running marathons. In Umeå he discovered cross-country skiing. While visiting Umeå in March 2005, Jop went on a ski-tour across the frozen sea. He has not been seen since, despite intensive searches. Until now he has not been found. Our thoughts are with Petra and his 2 children.

webmaster@cs.uu.nl, Thu Mar 31 10:04:48 MEST 2005