Peter H. Byers, MD is a medical geneticist and Professor of Pathology and Medicine at the University of Washington. He received an undergraduate degree in anthropology from Reed College in Portland, Oregon and medical training at Case Western University in Cleveland, Ohio. He trained in internal medicine at UCSF before completing three years as a research associate at the National Institute of Dental Research, National Institutes of Health where he worked with George R. Martin to examine collagen biosynthesis and structure. He moved to the University of Washington for a fellowship in Medical Genetics and at the same time worked with Paul Bornstein in Biochemistry to begin to identify the underlying bases of heritable connective tissue disorders including forms of Ehlers-Danlos syndrome and osteogenesis imperfecta. His contributions to understanding these disorders range from the identification of mosaicism as a factor in variation in clinical severity of heritable disorders as well as an explanation for birth of affected siblings to unaffected parents, to studies of natural history of several genetic conditions.