Dr. David S. Allan is a clinician scientist at the Ottawa Hospital Research Institute, affiliated with the Blood & Marrow Transplant Program at the University of Ottawa. His research interests focus of fundamental aspects of vascular progenitor biology and on translational studies in the repair of organ toxicity in patients undergoing hematopoietic stem cell transplantation. Dr. Dirk Strunk is a clinician scientist with the Hematopoietic Stem Cell Transplantation Program and Head of Stem Cell Research at the Medical University of Graz in Austria. His research team develops novel transplantation strategies using mesenchymal stromal cells and endothelial progenitors and has developed animal protein-free methods of cell expansion that facilitate translational studies in humans.