• Fellowship Program Leadership

    David Williams, MD

    Dr. David A. Williams

    Dr. David A. Williams - Chief, Division of Hematology/Oncology, Fellowship Director and Director of Translational Research at Children’s Hospital, and Leland Fikes Professor of Pediatrics at Harvard Medical School.  Dr. Williams is an internationally recognized researcher, with major interests in the study of blood stem cell biology, blood formation, leukemia, and the treat­ment of genetic blood disorders using gene therapy. He has won numerous prestigious awards for his research, including the Dameshek Award for outstanding research in hematology and the E. Mead Johnson Award for research in pediatrics, the Donald Metcalf and the Frank Oski Awards for his research in hematopoiesis. He was an Investigator of the Howard Hughes Medical Institute for 16 years and is a member of the National Academy of Sciences Institute of Medi­cine and a Fellow of the American Association for the Advancement of Science. Dr. Williams trained in hematology/oncology at Boston Children’s Hospital and the Dana-Farber Cancer Institute. During his fellowship research at the Whitehead Institute he developed techniques for intro­ducing genes into hematopoietic stem and progenitor cells using retroviruses that are still used in gene therapy to­day. Dr. Williams has a strong interest in translational research. He co-discovered Interleukin-11 (NeumegaTM).  He discovered the utility of fibronectin (RetronectinTM) to facilitate viral vector medicated stem cell gene transduction and is leading gene therapy trials in pa­tients with several genetic diseases. He recently served as a member of the National Institute of Health (NIH) Recombinant DNA Advisory Committee and the NIH Gene Therapy Safety Advisory Board.  Dr. Williams continues to see patients and directed the Clinical Hematology Service at Children’s dur­ing his previous years as a faculty member.  He has a specific clinical focus on bone marrow failure syndromes and aplastic anemia.  Dr. Williams was previously the Director of the Division of Ex­perimental Hematology and Associate Chairman for Translational Research at Cincinnati Children’s Hospital. Prior to that, he was the inaugural Director of the Herman B Wells Center for Pediatric Research at Indiana University School of Medi­cine.

    Jennifer Mack, MD

    Dr. Jennifer Mack

    Dr. Jennifer Mack – Associate Program Director of the Pediatric Hematology/Oncology Fellowship at Boston Children’s Hospital and the Dana-Farber Cancer Institute and Assistant Professor of Pediatrics at Harvard Medical School.  She is a graduate of the fellowship program in Pediatric Hematology/Oncology.  Additionally, her training has included a Pediatric Health Services Research Fellowship, a Master’s degree in Public Health from the Harvard School of Public Health, and dedicated fellowship training in Pediatric Palliative Care.  Dr. Mack served as the Medical Director of the Inpatient Oncology Service at Boston Children’s Hospital from 2004 to 2009.  Dr. Mack’s research focuses on parent-physician communication and palliative care.  Dr. Mack is an enthusiastic teacher, and is known for her patience and thoughtfulness in her interactions with patients and fellows.

    Stuart Orkin, MD

    Dr. Stuart H. Orkin

    Dr. Stuart H. Orkin – Head of the Combined Program in Hematology/Oncology at Boston Children’s Hospital and Dana-Farber Cancer Institute, David G. Na­than Professor of Pediatrics at Harvard Medical School, Investigator of the How­ard Hughes Medical Institute, and Chair of the Dept. of Pediatric Oncology at the DFCI. Dr. Orkin is a world-renowned researcher who has made extraordinary contributions to our understanding of the molecular basis of thalassemias, and the mechanisms that regulate the lineage specification and differentiation of he­matopoietic stem cells in their transitions to blood cells, the biology of stem cells, and the molecular mechanisms responsible for cancer. Dr. Orkin discovered the technique of position cloning when he cloned the gene responsible for chronic granulomatous disease. He also initiated the molecular dissection of von Willebrand’s disease through his cloning of vWF, and the understanding of molecular hematopoiesis through the cloning of GATA1, FOG1 and other transcription factors that control the differentiation of hematopoietic stem cells. These and other seminal contributions have been recognized by his election to the National Academy of Sciences and the American Academy of Arts and Sciences, by his selection to be the President of the American Society of Clinical Investigation, and by receipt of numerous prizes, including the Dameshek, E. Donnall Thomas and Mentor Awards from the American Society of Hematology and the E. Mead Johnson Award from the American Academy of Pediatrics.

    Jennifer Kesselheim, MD

    Dr. Jennifer C. Kesselheim

    Dr. Jennifer C. Kesselheim – Pediatric Hematology/Oncology, Associate Fellowship Program Director for Education, Division of Hematology/Oncology, Assistant Professor of Pediatrics, Harvard Medical School Dr. Kesselheim attended college at the University of Wisconsin and then completed her MD degree at the University of Pennsylvania. While at Penn, she earned a Masters degree in medical ethics. During her residency training in pediatrics at Boston Children’s Hospital, Dr. Kesselheim developed and implemented an ethics curriculum for residents and engaged in research about how pediatricians learn ethics during their training. As a fellow in pediatric hematology-oncology, Dr. Kesselheim completed coursework to earn a Masters degree in education from Harvard. As an educator, she designs curricula and evaluation instruments for residency and fellowship training related to humanism, ethics, and professionalism. She oversees the formal teaching curriculum and leads initiatives on evaluation and feedback for the fellowship in pediatric hematology-oncology. Her research continues to focus on the methods and outcomes of physician education in the areas of ethics and professionalism. She currently chairs the Certification and Continuing Education Committee in the American Society of Pediatric Hematology-Oncology, co-chairs the Ethics Advisory Committee at Dana-Farber Cancer Institute, and serves as the medical educator in the Office of Graduate Medical Education at Boston Children’s Hospital.


    Chester A. Alper, MD

    Edward J. Benz, Jr, MD

    George Q. Daley, MD, PhD

    Lisa Diller, MD

    Todd Golub, MD

    Holcombe E. Grier, MD

    Tomas Kirchhausen, PhD

    Judith Lieberman, MD, PhD

    A. Thomas Look, MD

    Samuel E. Lux, MD

    Alan D. Michelson, MD

    David G. Nathan, MD

    Ellis J. Neufeld, MD, PhD

    Stuart H. Orkin, MD

    David S. Pellman, MD

    Orah S. Platt, MD

    Stephen E. Sallan, MD

    David A. Williams, MD

    Leonard I. Zon, MD

    Associate professors

    Amy L. Billett, MD

    A. Lindsay Frazier, MD

    Todd R. Golub, MD

    Allen M. Goorin, MD

    Richard Gregory, PhD

    Mark W. Kieran, MD, PhD

    Carla Kim, PhD

    Wendy London, PhD

    Roslyn W. Orkin, PhD




    Barry Paw, MD

    Eileen Remold-O’Donnell

    Charles Roberts, MD, PhD

    Carlos Rodriguez-Galindo, MD

    Colin A. Sieff, M.B. B.Ch.

    Lewis Silverman, MD

    Kimberly Stegmaier, MD

    Loren Walensky, MD, PhD

    Joanne Wolfe, MD

  • Fellowship Brochure


    Learn everything you need to know about our Fellowship Program in this detailed brochure. Get information on salary, benefits the application process and much more.

  • Contact Us

    For questions regarding our fellowship program, please contact Fellowship Program Coordinator Trishna Rana at 1-617-919-3041 or email trishna.rana@childrens.harvard.edu.
  • Outstanding Care

    Dr. Stuart Orkin, Chair of Pediatric Oncology, describes the unparalleled resources available at Dana-Farber/Boston Children's.