Prof. David Sillence, AM, MBBS (Syd), MD (Melb), FRACP, FRCPA, FAFPHM, FAFRM, is a Professor in the Discipline of Genetic Medicine in the University of Sydney and a Consultant Physician to the Connective Tissue Dysplasia Clinic and Centre for Children Bone Health at The Children’s Hospital at Westmead. He has worked in the field of genetic disorders of Bone and Mineral Metabolism for three decades. He has collaborated widely and with collaborators at The Children’s Hospital at Westmead has developed a comprehensive multidisciplinary program for the skeletal investigation and medical treatment of children with Heritable Disorders of Connective Tissue encompassing Osteogenesis Imperfecta, other genetic skeletal dysplasias and genetic bone and mineral disorders. Professor Sillence and his collaborators pioneered the evaluation of bone density by Dual Energy X-ray Absorptiometry in children in Australia and treatment of osteoporosis with various regimens of the class of drugs known as bisphosphonates. He is the spokesperson on osteogenesis imperfecta syndromes on behalf of the International Nomenclature Committee for Constitutional Disorders of the Skeleton.