JD Hald is a dedicated researcher with a with profound passion for understanding rare disorders, including rare calcium metabolic disorders. Throughout her career, she has worked in the field of rare endocrine disorders. She works diligently towards bridging the knowledge gaps in collagen type 1 related disorders, such as osteogenesis imperfecta. Here she has contributed with a number of clinical studies, descriptive as well as studies focused on fracture preventive therapy. She has published together with many well known international specialists in recognized medical journals, such as JAMA.