This new volume of Current Topics in Developmental Biology covers Stem Cells in Development and Disease. The chapters provide a comprehensive set of reviews covering such topics as the mechanisms of pluripotency in vivo and in vitro, hematopoietic stem cell development, intestinal stem cells and their defining niche, epithelial stem cells in adult skin, the mammary stem cell hierarchy, satellite cells, neural stem cells of the hippocampus, lung stem and progenitor cells in tissue homeostasis and disease, spermatogonial stem cell functions in physiological and pathological conditions, the origin, biology, and therapeutic potential of facultative adult hepatic progenitor cells, nephron progenitor cells, adult stem cell niches, cancer stem cells, pluripotency and cellular heterogeneity, and cellular mechanisms of somatic stem cell aging