Jonas Keller is a staff member of the Quantum Technology Competence Center (QTZ) at Physikalisch-Technische Bundesanstalt (PTB). He obtained his PhD in 2015 from Leibniz University of Hannover for research toward a new generation of optical atomic clocks, carried out in Tanja Mehlstäubler's group at PTB. In 2017, he joined David Wineland’s group at NIST Boulder to work on 2D trapped-ion arrays for quantum simulations and quantum information processing. This work involved the demonstration of quantum-enhanced sensing methods for electric field noise. He returned to PTB in 2020, where he works on the development of optical atomic clocks and setting up an ion trap user facility within the QTZ. This facility will support the development of ion trap technology for metrology and quantum information and will allow sharing PTB's expertise in this field with academia and industry partners.