Jennifer Leiding, M.D., is associate director for clinical research in the Johns Hopkins All Children’s Institute for Clinical and Translational Research and assistant director of the Center for Cellular and Gene Therapy in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She is also an associate professor of pediatrics (pending academic review) based on the St. Petersburg, Florida, campus in the Johns Hopkins University of School of Medicine. Dr. Leiding, whose clinical specialty is allergy and immunology, focuses on strategic growth of, and mentorship in, clinical research and early-phase trials campus-wide, as well as cellular and gene therapies for cancer and blood disorders. Her personal line of research and national leadership focuses on cooperative multicenter studies of primary immunodeficiency diseases, including chronic granulomatous disease (CGD) and other rare diseases in children. She returned to Johns Hopkins All Children’s in 2024 after previously serving on the faculty at the USF Morsani College of Medicine and the medical staff of All Children’s for nearly a decade. In between, she worked as a medical director at a gene therapy-focused biotech company. Dr. Leiding earned her medical degree from USF before training there as an intern and resident in pediatrics. She completed her clinical and research fellowship in both allergy and immunology at the National Institute of Allergy and Infectious Diseases. Dr. Leiding is rated as an Elite provider by MediFind in the treatment of Chronic Granulomatous Disease. Her top areas of expertise are Chronic Granulomatous Disease, Primary Immunodeficiency (PID), Severe Combined Immunodeficiency (SCID), and Clouston Syndrome.

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 Chronic Granulomatous Disease. 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.

Jolan Walter is a Pediatric Allergy and Immunologist in St Petersburg, Florida. Dr. Walter is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. Her top areas of expertise are Severe Combined Immunodeficiency (SCID), Primary Immunodeficiency (PID), Infantile Neutropenia, and Common Variable Immune Deficiency.

Dr. Sriaroon is the medical director of the outpatient USF Allergy/Immunology clinic at Johns Hopkins All Children’s Hospital and the director of the USF Pediatric Allergy/Immunology fellowship training program. She is also the medical director of the Johns Hopkins All Children's Food Allergy Clinic. She is an associate professor of internal medicine and pediatrics at the University of South Florida (USF) Morsani College of Medicine. Dr. Sriaroon sees patients with various allergic and immunologic conditions and teaches medical students, residents and fellows. She has been invited to give presentations nationally and internationally. Her clinical and research interests include food allergy and primary antibody immunodeficiency. She has authored several peer-reviewed articles and has ongoing clinical trials on food allergy and immunoglobulin therapy. Currently, Dr. Sriaroon serves as USF site director of Food Allergy Research & Education (FARE) Clinical Network. Dr. Sriaroon received her medical degree from the Chulalongkorn University in Thailand. She completed her pediatric residency at Mount Sinai Hospital in Chicago and a fellowship in allergy/immunology at USF. She joined the faculty at USF and the medical staff at Johns Hopkins All Children’s in 2009. Dr. Sriaroon is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. Her top areas of expertise are Food Allergy, Asthma, Common Variable Immune Deficiency, and Primary Immunodeficiency (PID).

Dr. Chellapandian is the division chief of blood and marrow transplant and specializes in bone marrow transplant as a hematologist-oncologist and serves as Director of the Center for Cell and Gene Therapy for Non-Malignant Conditions (CCGNC) in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. He joined the hospital staff in 2017. Dr. Chellapandian earned his medical degree from Madurai Medical College and then trained at Postgraduate Institute of Medical Education and Research, both in India. He completed a residency in pediatrics at Albert Einstein Medical Center in Philadelphia. Dr. Chellapandian completed a pediatric hematology-oncology and bone marrow transplantation fellowship at Hospital for Sick Children/University of Toronto and an advanced fellowship on bone marrow transplantation and cellular therapy at St. Jude Children’s Research Hospital in Memphis, Tennessee. Dr. Chellapandian's clinical and research interests include hematopoietic stem cell transplant for primary immunodeficiency, immune dysregulation disorders, sickle cell disease, thalassemia, and treatment of histiocytic disorders. He has special focus on ex-vivo graft engineering techniques and autologous gene therapy. He has adapted new methods of T- cell depletion using haploidentical transplantation to transplant patients lacking a suitable matched donor. He has numerous scientific papers and review articles published in this field. Dr. Chellapandian is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. His top areas of expertise are Severe Combined Immunodeficiency (SCID), Non-Langerhans-Cell Histiocytosis, Infantile Neutropenia, Reticulohistiocytoma, and Bone Marrow Transplant.

Aleksandra Petrovic is a Pediatric Hematologist Oncology provider in St Petersburg, Florida. Dr. Petrovic is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. Her top areas of expertise are Severe Combined Immunodeficiency (SCID), X-Linked Severe Combined Immunodeficiency, Graft Versus Host Disease (GvHD), Bone Marrow Transplant, and Vitrectomy.

Valentina Lassalle is a primary care provider, practicing in Internal Medicine in Saint Petersburg, Florida. Dr. Lassalle is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. Her top areas of expertise are Chronic Granulomatous Disease, Blau Syndrome, Cirrhosis, and Xanthoma.

David Vargas is a Radiologist in Tampa, Florida. Dr. Vargas is rated as an Experienced provider by MediFind in the treatment of Chronic Granulomatous Disease. His top areas of expertise are Pleural Effusion, Ascites, Bronchogenic Cyst, Pleurisy, and Bone Marrow Aspiration. Dr. Vargas is currently accepting new patients.