Dr. Wei Xu who joined our team more than 6 years ago is leaving us effective June 30th to take up a new position as Associate Professor (tenure-track) at the Beijing Institute of Technology. It has been great pleasure for all of us woking with Wei and having him on our team for so many years. We thank Wei for the great work he did in Berlin, and for his remarkable commitment and dedication to Humboldt University. We wish him all the best and look forward to welcoming him back to HU whenever he finds the time to visit us.