We regret to announce the passing of Associate Professor Horst Elmar Winkelnkemper on April 10, 2016. Elmar received his PhD at Princeton in 1971, and spent two years at the Institute for Advanced Study before coming to Maryland in 1973. During his career he visited IHES in Bures-sur-Yvette, France and the Instituto de Matematicas, UNAM, in Cuernavaca, Mexico, and gave an Arbeitstagung talk in Bonn, Germany. One of his earliest results, which attracted a lot of attention, showed that a simply connected closed manifold in sufficiently high dimension has a decomposition as an "open book" if and only if its signature vanishes. Winkelnkemper's most cited publications are a short proof, joint with Fields Medalist Bill Thurston, that every closed 3-manifold admits a contact structure, and "The graph of a foliation", eventually used by another Fields Medalist, Alain Connes, in defining the C*-algebra of a foliation. There is a nice mathematical appreciation of Elmar's work by none other than Dennis Sullivan in the AMS Notices, Augest 2016 issue, page 829.