- 2013 - 2017
DirectorBlood and Marrow Transplant Program, Division of Hematology/Oncology, Department of Internal Medicine
- 2010
Course Co-DirectorHematology Board Review, National Institutes of Health
- 2010
MemberAmerican Society of Hematology
- 2009
Course Co-DirectorHematology Board Review, National Institutes of Health
- 2006 - 2010
MemberOffice of Security and Strategic Information, U.S. Department of Health and Human Services
- 2006 - 2010
MemberOD Dual Use Committee, National Institutes of Health
- 2005 - 2006
Associate DirectorDepartment of Security and Emergency Response, National Institutes of Health
- 2000 - 2010
MemberClinical Center Credentialing Committee, NIH Clinical Center, National Institutes of Health
- 2000 - 2010
ChairDivision of Hematology, NIH Clinical Center, National Institutes of Health
- 2000 - 2010
DirectorBone Marrow Pathology Laboratory, Warren Grant Magnusson Clinical Center, National Institutes of Health
- 1996 - 2000
ChairDivision of Hematology/Oncology, Department of Internal Medicine
- 1994 - 2000
DirectorBlood and Marrow Transplant Program, Division of Hematology/Oncology, Department of Internal Medicine
- 1993 - present
ChairScientific Committee, Board of Directors, Blood Systems
- 1990 - 1993
DirectorBone Marrow Transplantation Program