Willem Lems is Professor of Rheumatology at Amsterdam UMC, where he is also currently the vice-chair and the Educational Officer of the Department of Rheumatology. Professor Lems completed his medical education in 1983 and qualified as Rheumatologist in 1993. Since then, his research into Metabolic Changes in Patients with Rheumatic Diseases has led to the publication of over 400 articles. Apart from Bone Diseases, his current research focusses on the early treatment of Rheumatoid Arthritis as well as targeting phenotypes in hip- and knee osteoarthritis. He is the founding member of the Oslo-Truro-Amsterdam collaborative study, is on the editorial board of several journals, including Osteoporosis International, and served as member of the Scientific Committee for EULAR, IOF and ECTS and most recently as Clinical Co-Chair for ECTS 2021. He is a member of the ECTS corporate engagement group and, together with Astrid Bakker, organised the 2018 ECTS PhD training course.