Jennifer Lynne Root Mayer, M.D.

Headshot of Jennifer Lynne Root Mayer


Pediatric Oncology

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St Petersburg Outpatient Care Center - Hematology Oncology

601 5th Street South
St Petersburg, FL 33701
Phone: 727-767-4176 | Fax: 727-767-4379
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Dr. Mayer is a pediatric hematologist-oncologist in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in the diagnosis and management of patients with acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), chronic myeloid leukemia (CML), Hodgkin lymphoma and non-Hodgkin lymphoma. She is also the medical director of the Vascular Anomalies and Birthmarks Program at the hospital. She cares for patients with benign and aggressive vascular tumors, lymphatic and venous malformations, and overgrowth syndromes.
Dr. Mayer is the author of more than 30 publications and two textbook chapters. She has presented over 22 research abstracts at national and international medical conferences. She is currently working toward the establishment of a three-year fellowship training program in pediatric hematology-oncology on our St. Petersburg, Florida, campus. Dr. Mayer joined Johns Hopkins All Children’s in 1996 and received the hospital’s Best Consulting Physician Award in 2017.
Dr. Mayer received her medical degree with honors from Dartmouth Medical School in New Hampshire. She completed her pediatric residency, hematology-oncology fellowship, and clinical research fellowship at Yale University School of Medicine in Connecticut. She is board-certified in both General Pediatrics and Pediatric Hematology-Oncology. She is a fellow of the American Academy of Pediatrics and an active member and clinical researcher with Children’s Oncology Group, American Society of Pediatric Hematology-Oncology, and the International Society for the Study of Vascular Anomalies. more



  • MD; Geisel School of Medicine at Dartmouth (1989)


  • Pediatrics; Yale-New Haven Hospital (1992)


  • Pediatric Hematology-Oncology; Yale-New Haven Hospital (1995)

Board Certifications

  • American Board of Pediatrics (Pediatric Hematology-Oncology) (1996)
  • American Board of Pediatrics (Pediatrics - General) (1992)
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