The Harvard Stem Cell Institute (HSCI) unites scientists at Harvard and its affiliated hospitals with the shared goal of advancing stem cell research to treat injury and disease and the analysis of related political, legal, and ethical issues. HSCI publishes StemBook, which provides current, peer-reviewed chapters on topics related to stem cell biology; as well as timely perspectives, interviews, and news. It also serves as a resource for the stem cell research community, educators, and the interested non-specialist as well as a tool to foster discussion and build community among its readers.