Dr. Colin Moore

Dr. Ayala is the director of the Hemophilia and Bleeding Disorders Treatment Center at Johns Hopkins All Children's Hospital. She also is the hematology leader of the Young Women Bleeding Disorders/Menorrhagia Clinic, which focuses on a multidisciplinary approach to bleeding symptoms in girls and young women. Dr. Ayala also is involved in the Immune Dysregulation Clinic, which evaluates patients with autoimmune cytopenias in a multidisciplinary approach. Dr. Ayala joined the hospital in 2000. She was the chair of the Division of Hematology/Oncology between 2013-2017 and also served as interim director for the division between 2015-2016. Dr. Ayala's research experience includes multicenter national and international projects. Dr. Ayala received her medical degree from the University of Puerto Rico School of Medicine, her residency training at the San Juan City Hospital in Puerto Rico and her fellowship training at the Emory University School of Medicine Division of Pediatric Hematology/Oncology. Dr. Ayala is a member of the American Society of Pediatric Hematology/Oncology and the Hemophilia and Thrombosis Research Society. Dr. Ayala is rated as an Experienced provider by MediFind in the treatment of Immune Thrombocytopenic Purpura (ITP). Her top areas of expertise are Hemophilia A, Venous Thromboembolism (VTE), Blood Clots, and Evans Syndrome.

Dr. Metts specializes in pediatric hematology/oncology in the Johns Hopkins All Children's Cancer & Blood Disorders Institute. He sees patients on our main campus in St. Petersburg and at the Johns Hopkins All Children’s Outpatient Care Center in Tampa. He joined the hospital in 2016. He received his medical degree from the University of South Carolina School of Medicine and completed an internship and residency in pediatrics at Johns Hopkins All Children’s Hospital through the University of South Florida Morsani School of Medicine. Dr. Metts then trained at Emory University School of Medicine as a pediatric hematology/oncology fellow. His clinical interests include sarcomas, rare solid tumors, and Phase 1 and Phase 2 trials for pediatric solid tumors. Dr. Metts is rated as a Distinguished provider by MediFind in the treatment of Immune Thrombocytopenic Purpura (ITP). His top areas of expertise are Osteosarcoma, Ewing Sarcoma, Rhabdomyosarcoma, and Adult Soft Tissue Sarcoma.

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 Immune Thrombocytopenic Purpura (ITP). Her top areas of expertise are Acute Lymphoblastic Leukemia (ALL), Evans Syndrome, Acute Monoblastic Leukemia (AmoL), and Teratoma of the Mediastinum.