This issue of Hematology/Oncology Clinics will focus on Gene Therapy. Topics include, but are not limited to Historical Perspective and Current Renaissance, Integrating Vectors, Nonintegrating Vectors, Gene Editing, Conditioning Therapies for Autologous HSCT, Approaches to Immunodeficiency, Approaches to Hemoglobinopathy, Approaches to Hemophilia, Hematopoietic Gene Therapies for Neurologic and Metabolic Disease, Gene Therapy Approaches to HIV and other Infectious Diseases, HSC Approaches to Cancer, and Gene Modified T Cell Therapies for Cancer.