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From 1989 to 1990 he was a visiting scholar at Purdue University, West Lafayette, Indiana, USA, sponsored by a fellowship of the German Academic Exchange Service (DAAD). From 1991 to 1993 he worked for Siemens, Corporate Research and Development, in Munich, Germany, conducting research in the areas of image processing and biomedical signal processing. From 1993 to 1996 he was a research associate with the Institute of Circuit Theory and Signal Processing at Munich University of Technology, Germany, where his research was focused on smart antennas.
In 1997 he joined Siemens Mobile Networks in Munich, Germany, where he was responsible for strategic research for third generation mobile radio systems. From 1998 to 2001 he was the Director for International Projects and University Cooperation in the mobile infrastructure business of Siemens in Munich, Germany, where his work focused on mobile communications beyond the third generation. He was appointed to a think tank of experts within the IST project WSI (Wireless Strategic Initiative). During his time at Siemens, he also taught in the international Master of Science in Communications Engineering program at Munich University of Technology.
In the fall of 2006 and the fall of 2007 he was a visiting professor at the University of Nice in Sophia-Antipolis, France, and at the University of York, UK, respectively. From 2012 to 2017, he also served as an Honorary Visiting Professor in the Department of Electronics at the University of York, UK, and in 2019 as an Invited Professor at the Université de Lorraine in Nancy, France.
His research interests include wireless communications, array signal processing, high-resolution parameter estimation, as well as numerical linear and multi-linear algebra.
From 2011 to 2019 he was an elected member of the Sensor Array and Multichannel (SAM) technical committee of the IEEE Signal Processing Society, where he served as the Vice Chair (2015 – 2016), Chair (2017 – 2018)), and Past Chair (2019). Since 2020, he has been an elected member of the Signal Processing Theory and Methods (SPTM) technical committee of the IEEE Signal Processing Society. Moreover, he has served as the technical program chair of
the IEEE International Symposiums on Personal Indoor and Mobile Radio Communications (PIMRC) 2005 in Berlin, Germany,
Furthermore, he has served on the Awards Board of the IEEE Signal Processing Society (2009 - 2010) and as the counsellor of theIEEE Student Branch at Ilmenau University of Technology (TU Ilmenau) (since 2008).