 In 1965 he became Professor at the Hochschule für Musik in Cologne and directed their studio for electronic music until 1971 .Together with Hans Ulrich Humpert, his successor at the electronic studio of the Musikhochschule, he worked on the "Lexikon der elektronischen Musik" (Dictionary of Electronic Music).Just short of completing the manuscript, Eimert died on 15 December 1972, either in Düsseldorf or Cologne .