| 2012~ | Professor, Department of Leukemia, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX |
| 2012~ | Chief, Section for Myeloproliferative Neoplasms, Leukemia Department, Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX |
| 2012~ | Director, Hanns A. Pielenz Clinical Research Center for Myeloproliferative Neoplasms, Leukemia Department, Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX |
| 2009~ | Medical Advisory Board Member, American Partnership for Eosinophilic Disorders |
| 2005~ | Medical Advisory Board Member, The Mastocytosis Society |
| 2005~ | Medical Advisory Board Member, The Chronic Myeloproliferative Disorders Education Foundation |
| 2005~ | Executive Committee Member, International Working Group for Myelofibrosis Treatment and Research (IWG-MTR) |
| 2003-2008 | Graduate Faculty, Graduate School of Biological Sciences, University of Texas, Houston, TX |