Director, Children’s Research Institute Mary McDermott Cook Chair in Pediatric Genetics Kathryne and Gene Bishop Distinguished Chair in Pediatric Research Investigator, Howard Hughes Medical Institute University of Texas Southwestern Medical Center "Niches for stem cells and progenitors in bone marrow"

Director, Cancer Pathology Program, Division of Experimental Hematology & Division of Pathology Co-Leader, Program in Hematologic Malignancies of Cincinnati Children's Hospital Medical Center, Cancer and Blood Diseases Institute Professor, Department of Pediatrics, University of Cincinnati