Jens is an ELLIS Scholar and IEEE Senior Member. Jens served as co-chair of the IEEE-RAS TC Robot Learning (2016-2021), as the Virtual Conference Arrangements Chair for Robotics: Science and Systems 2020, as a Program Chair for the Conference on Robot Learning 2020, as the Finance Chair for the International Conference on Advanced Intelligent Mechatronics 2021, as associate editor for the IEEE Transactions on Robotics, and as editorial board member of the Journal of Machine Learning Research. He currently serves as a Local Arrangements Chair for Robotics: Science and Systems 2024, Secretary of the Robot Learning Foundation, as Member of the International Advisory Board - CIIRC - Czech Technical University in Prague, as board member of the ELLIS Unit Delft, as senior editor for the IEEE Robotics and Automation Letters, as associate editor for the IEEE/ASME Transactions on Mechatronics, as editor for the IEEE/RSJ International Conference on Intelligent Robots and Systems, as well as area chair/associate editor for numerous conferences. He has served as reviewer for most well-known journals and conferences in the fields of machine learning and robotics.