Appointments and Second Opinions

Speak with one of our New Patient Coordinators to schedule an appointment, refer a patient or request a second opinion. In urgent cases, we can typically see new patients within 24 hours.

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Find Clinical Trials

We sponsor and collaborate on clinical trials that break new ground in pediatric cancer and blood disorder treatment. 

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Our Affiliations
HMS Affiliate

Dana-Farber/Boston Children's is a teaching affiliate of Harvard Medical School.

Our Affiliations

David A. Williams, MD

  • Associate Chairman, Department of Pediatric Oncology
  • Chief, Hematology/Oncology, Boston Children's Hospital
  • Institute Physician
  • Leland Fikes Professor of Pediatrics, Harvard Medical School

Appointment Phone

  • 888-733-4662 (New Pediatric Patients)
  • 617-632-3270 (Established Pediatric Patients)


  • 617-730-0934


Treatment Centers


Clinical Interests

Aplastic anemia, Blood formation, Chronic granulomatous disease, Fanconi anemia and other genetic disorders, Gene therapy, Genetic blood disorders, Hematopoiesis, Neutropenia and neutrophil dysfunction syndromes, Stem cell biology, Viral vectors



Board Certifications

  • Pediatrics


  • Boston Children's Hospital/Dana-Farber Cancer Institute, Pediatric Hematology/Oncology, 1985


  • Cincinnati Children's Hospital Medical Center, Pediatrics, 1982


  • Pediatrics, Cincinnati's Children's Hospital Medical Center, Cincinnati, OH, 1980

Medical School

  • Indiana University School of Medicine, Medicine, 1979


Dr. David A. Williams is a graduate of Indiana State University and Indiana University School of Medicine. After training in Pediatrics at Cincinnati Children's Hospital Medical Center, Dr. Williams completed fellowship training in Pediatric Hematology/Oncology at Dana-Farber/Boston Children's. He completed his research training here and at the Whitehead Institute at the Massachusetts Institute of Technology. He then became a faculty member at Harvard Medical School and of the Howard Hughes Medical Institute (HHMI).

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