Old notices
These pages collect together notices posted on the IUCr web site in past years. They are retained for archival interest, but there is no guarantee (or likelihood) that many of the web links found in these notices will still be active.
Ted Janssen 1936-2017
On 29 September 2017, Emeritus Professor T. W. J. M. (Ted) Janssen passed away at the age of 81 years. Together with Aloysio Janner he was one of the founders of the superspace approach in crystal-structure analysis for the description of quasiperiodic crystals and modulated structures. Ted was a Co-editor for Acta Crystallographica Section A from 1993 to 2002, and was awarded the Aminoff prize of the Royal Swedish Academy of Science (with P. M. de Wolff and A. Janner) in 1988 and the tenth Ewald prize of the International Union of Crystallography (with A. Janner) in 2014. Ted was highly respected for his ability to combine a deep knowledge of physics with a rigorous mathematical approach, and his work with Janner had a huge impact on the development of crystallography. He will be sorely missed by his many friends and colleagues in the crystallographic community. A full obituary will be published in due course.
