Dr. Vlachos is the chief of hematology in the Johns Hopkins All Children’s Hospital Cancer & Blood Disorders Institute in St. Petersburg, Florida, and professor of pediatrics (PAR) in the Johns Hopkins University School of Medicine. She joined the hospital staff in 2024. She was previously professor of pediatrics at Zucker School of Medicine at Hofstra/Northwell and attending physician in hematology/oncology at Cohen Children’s Medical Center/Northwell Health, where she was head of the Bone Marrow Failure Program and head of the pediatric hematology/oncology trials office. Dr. Vlachos is internationally known for clinical care and expertise in bone marrow failure syndromes and her transformational research in Diamond Blackfan anemia (DBA) syndrome, a rare inherited bone marrow failure syndrome. Dr. Vlachos is the founder and has directed the Diamond Blackfan Anemia Registry (DBAR) of North America since its inception in 1991. She is the principal investigator and co-investigator on multiple grants funded by the National Institute of Health and the Centers for Disease Control and Prevention. She has published numerous articles on her research findings and has been invited to author papers and book chapters on bone marrow failure syndromes and DBA. Dr. Vlachos is a member of the Medical and Scientific Advisory Board for the Shwachman-Diamond Syndrome Registry, is a member of the Scientific Advisory Board for the Diamond Blackfan Anemia Foundation and holds a position on the Scientific Program Committee for Bone Marrow Failure of the American Society of Hematology. She earned her medical degree from New York Medical College in Valhalla, New York. She completed her residency in pediatrics at North Shore University Hospital in Manhasset, New York. She then completed a clinical fellowship in bone marrow transplantation at North Shore University Hospital, followed by a fellowship in pediatric hematology-oncology and bone marrow transplantation at Mount Sinai Medical Center in New York. Videos Bone Marrow Failure Syndrome Expert Dr. Adrianna Vlachos at Johns Hopkins All Children’s. Dr. Vlachos is rated as an Advanced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). Her top areas of expertise are Aase Syndrome, Pure Red Cell Aplasia, Aplastic Anemia, and Transient Erythroblastopenia of Childhood.

Gregory Hale is a Pediatric Hematologist Oncology provider in St Petersburg, Florida. Dr. Hale is rated as an Advanced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Leukemia, Acute Lymphoblastic Leukemia (ALL), Chronic Graft Versus Host Disease (cGvHD), Graft Versus Host Disease (GvHD), and Bone Marrow Transplant.

Dr. Dean is a hematologist-oncologist in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She joined the hospital staff in 2021. She was previously an attending physician with Pediatric Specialists of Virginia in the Center for Cancer and Blood Disorders and with Children’s National Hospital. Dr. Dean was the director of the Long-Term Follow-Up program at Pediatric Specialists of Virginia and Children’s National Hospital and director of the neuro-oncology program at Pediatric Specialists of Virginia. She was also a senior physician on the leukemia and lymphoma team. She was an assistant professor in the Department of Pediatrics at George Washington University School of Medicine and Health Science. Dr. Dean has published peer-reviewed articles, authored book chapters and lectured both nationally and internationally. Her clinical and research interests include the impact of physical activity on overall function, cardiac function and quality of life in leukemia and lymphoma patients. Dr. Dean earned her medical degree from Wake Forest University in Winston-Salem, North Carolina. She completed an internship and residency in pediatrics and a fellowship in pediatric hematology-oncology at St. Louis Children’s Hospital/Washington University in St. Louis. Dr. Dean is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). Her top areas of expertise are Acute Lymphoblastic Leukemia (ALL), Immune Thrombocytopenic Purpura (ITP), and Neurofibromatosis Type 1 (NF1).

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. She was named the William A. Baumgartner Physician of the Year for Johns Hopkins All Children's in the 2024 Johns Hopkins Medicine Clinical Awards. She previously received the hospital’s Best Consulting Physician Award in 2017. 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 program director of a three-year fellowship training program in pediatric hematology-oncology on the St. Petersburg, Florida, campus. Dr. Mayer joined Johns Hopkins All Children’s in 1996. 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 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. Dr. Mayer is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). Her top areas of expertise are Acute Lymphoblastic Leukemia (ALL), Evans Syndrome, Acute Monoblastic Leukemia (AmoL), and Teratoma of the Mediastinum.

Dr. Alexander is a diagnostic radiologist at Johns Hopkins All Children’s. She sees patients on the hospital’s St. Petersburg, Florida, campus. She joined the medical staff in 2025. She was previously a radiologist at Boston Children’s Hospital. Dr. Alexander earned her medical degree from the University of Kansas School of Medicine in Wichita. She completed a diagnostic radiology residency at the University of Missouri in Kansas City. She then completed a diagnostic pediatric radiology fellowship followed by a pediatric musculoskeletal radiology fellowship at Boston Children’s Hospital. Dr. Alexander is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). Her top areas of expertise are Scoliosis, Osteochondritis Dissecans, Knock Knees, and Caffey Disease.

Dr. Oshrine specializes in blood and marrow transplants as a pediatric hematologist/oncologist in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. His clinical focus is in the treatment of high-risk leukemias with blood and marrow transplantation, and his research focus is in immune recovery after transplant. He joined the hospital in 2014 after completing a fellowship in pediatric hematology/oncology at the Children’s Hospital of Philadelphia. He received the Excellence in Service & Professionalism Award in the 2018 Johns Hopkins Medicine Clinical Excellence Awards. Dr. Oshrine is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Chronic Graft Versus Host Disease (cGvHD), Severe Combined Immunodeficiency (SCID), Graft Versus Host Disease (GvHD), Bone Marrow Transplant, and Gastrostomy.

Kenneth Caldwell is a Pediatric Hematologist Oncology provider in Saint Petersburg, Florida. Dr. Caldwell is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Leukemia, Infantile Neutropenia, Acute Lymphoblastic Leukemia (ALL), and Febrile Neutropenia.

Foaz Kayali is an Interventional Radiologist in St Petersburg, Florida. Dr. Kayali has been practicing medicine for over 17 years and is rated as an Experienced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Ascites, Pleurisy, Secondary Peritonitis, Liver Embolization, and Bone Marrow Aspiration.