1979-81 Instructor to Asst. Prof. of Pediatrics, Harvard Medical School & Children's Hospital Boston.
1981- 2018 Chief of Pediatric Hematology/Oncology, University of Massachusetts Medical School
1981-2005 Assistant Prof. to Professor of Pediatrics and Molecular Genetics, UMass Medical School
2000- Vice Chair for Research, Dept. Pediatrics, UMass Medical School; Interim Chair 2001-2002
2003- Professor of Molecular, Cell &Cancer Biology, UMass Medical School
2005- 2018 Ali and John Pierce Professor of Pediatric Hematology-Oncology, UMass Medical School, Worcester, MA
2018- Ali and John Pierce Professor of Pediatric Hematology-Oncology emeritus, UMass Medical School, Worcester, MA
Advisory Committees and Other Activities/Honors:
1986-89, 1995-99 NIH Hematology II Study Section
1979-2012 NIH Special Study Sections; ad hoc member, Hematology, ELB, and Immunodeficiency Study Sections
2002 NIH/NCI Pediatric Oncology Branch: Intramural Research Review Committee
1988-92 Editorial Board, BLOOD
2000-2003 Chair, Publications Committee, American Society of Pediatric Hematology/Oncology
2010-present Chair, Joint Publications Committee, ASPHO-SIOP
2002-2004 Chair, Scientific Committee on Pediatric Hematology, American Society of Hematology
2004- 2015 Associate then deputy editor, Pediatric Blood and Cancer
2015- Editor-in-chief, Pediatric Blood and Cancer
2006- Executive committee, Severe Chronic Neutropenia International Registry