St. Jude Children's Research Hospital, Memphis, Tennessee:
Associate Member (1987-89); Full Member (1990-present); Director of Leukemia/Lymphoma Division (1992-2006); Vice Chair of Oncology Department (1994-2006); Program Director, Hematological Malignancies Program of St. Jude Cancer Center (1995-present); Fahad Nassar Al-Rashid Chair of Leukemia Research (1999-present); Chair of Oncology Department (2006-present)
University of Tennessee Health Science Center:
Associate Professor of Pediatrics (1986-89); Professor of Pediatrics (1990-present); Director of Pediatric Oncology Division (2006-present)
Honorary Consultant, the Taiwan Pediatric Oncology Group (1988-present)
Honorary Professor, the University of Hong Kong (1993)
Consultant Professor, Shanghai Second Medical University (1998)
Honorary Professor, the Capital University of Medical Science (2003-present)
Visiting Professor, Shanghai Jian Tong University (2012);Honorable Adjunct Professor, National Taiwan University (2013); Chair Professor, Soochow University (2013); Honorary Professor, Shanghai Jian Tong University (2015); Honorary Professor, The Institute of Hematology & Blood Diseases Hospital Chinese Academy of Medical Sciences (2016)
Editor, Leukemia (2000-2016); Academic Editor, Peer J (2012-present); International Advisor Board, Lancet Oncology (2010-2013)and Lancet child & Adolescent Health.
Editorial Board: Journal of Clinical Oncology (1994-96, 1999-2004, 2009-2014), Blood (1994-98), Hem-Onc (2009-present), Leukemia (1991-2000), Acta Pediatrica (1995-present), Pediatrics and Neonatology (1995-present, previously Acta Pediatr Tw 1995-2007), Chinese Journal of Pediatrics (2003-present), Current Hematologic Malignancy Reports (2006-present), Journal of Adolescent and Young Adult Oncology (2010-present)
Chair, Scientific Advisory Board, VIVA foundation for Children with Cancer, Singapore (2006-present)
External referee for many national and international research foundations.
Keynote, symposium or Grand Rounds speaker in >500 national and international meetings