Professor Doctor Werner Keune of the University of Duisburg-Essen has spent more than 38 years (nearly four decades!) of his academic life focusing on the various applications of Mössbauer spectroscopy. Professor Keune (known simply as Werner in our community) officially retired in January 2006, but continues to be a very active Mossbauer researcher. Over the last four decades Werner has been the author/co-author of almost 200 research papers, with scientific collaborations from a very large number of countries, including Brazil, the US, Italy, India, Japan, Russia, Romania, and Spain. He has made significant contributions to the applications of this technique in specialized areas, such as thin films, surfaces and interfaces, and multilayers, and is considered to be a world-class Mössbauer researcher and an esteemed physicist.