Many of you will be saddened to hear that Horst Sachs has died. He passed away on 25 April 2016, having turned 89 only a few weeks before, on 27 March. - Sachs founded the graph theory school in Ilmenau, which served as an important link between east and west during the iron curtain time and afterwards. More than a hundred scientific papers, among them the seminal book on graph spectra (with Doob and Cvetkovic), established his excellent international reputation. After his retirement in 1992 until his last months he continued his research and showed up regularly at the institute.
Thomas Böhme - Jochen Harant - Matthias Kriesell - Michael Stiebitz
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