Since over 30 years Peter Pietschmann made numerous major and innovative contributions to the field of bone and osteoporosis research. His areas of research include markers of bone turnover, the pathogenesis of secondary osteoporosis, osteoporosis in men, the regulation of bone resorption and the development and characterization of in vivo models for bone research. On the basis of his broad experimental and clinical research experience he was among the first to delineate interactions between bone and the immune system, a field now termed “osteoimmunology”. Within the area of osteoimmunology, in particular his work relating the pathogenesis of age related osteoporosis to inflammaging and his contributions to bone pathology of inflammatory diseases should be highlighted. Peter Pietschmann has published over 260 papers in peer reviewed journals, 33 book chapters and edited three books. According to Scopus his H-index is 47. He has trained over 50 bachelor, master and doctoral students.