Stefan Krojer is a passionate purchaser and Head of Strategic Procurement at Johanniter Competence Center GmbH, Berlin. His career began at the hospital group Rhön-Klinikum. He gained his sales experience while working for the Group Purchasing Organization P.E.G. As a result, he was responsible for the project management for the logistics company Hospital Logiserve. As Head of Supply Chain Management at the St. Marien-Hospital Berlin he gained practical experience in the hospital procurement. With his study "Hospital Procurement 2025" published in June 2017, he is using his "Future Hospital Procurement" blog to promote transparency and dialogue between partners in hospital procurement. His specialty is digitization in hospital purchasing. He is a pioneer in social buying and social collaboration.