Dr. Waller’s research focus is in enhancing immune reconstitution after stem cell transplant and developing cell therapy for anti-tumor immunology and in regenerative medicine. His current research activities include pre-clinical and clinical studies focused on the role of donor immune cells in optimizing anti-tumor immunity after allogenic transplantation, and the clinical application of autologous CD34+ cells in improving vascular function and facilitating neo-angiogenesis in patients with peripheral and coronary vascular disease. His NIH-funded basic research lab uses mouse models and performs immunological analyses of clinical samples from patients. He has active translational research activities and serves as a principal investigator on institutional and national cooperative group clinical trials.