Dr. Hess specializes in pediatric ophthalmology in the Johns Hopkins All Children’s Department of Pediatric Medicine. He served as chief of the medical staff from 2017-2019. He joined the Johns Hopkins All Children’s Hospital medical staff in 2004. Dr. Hess earned his medical degree from the University of South Florida Morsani College of Medicine in Tampa, Florida. He trained as an ophthalmology resident at Medical College of Virginia and completed a pediatric ophthalmology fellowship at Duke University Eye Center. Dr. Hess is rated as an Advanced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). His top areas of expertise are Strabismus, Esotropia, X-Linked Infantile Nystagmus, and Amblyopia.

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 Neurofibromatosis Type 1 (NF1). Her top areas of expertise are Scoliosis, Osteochondritis Dissecans, Knock Knees, and Caffey Disease.

Dr. Geller specializes in pediatric neurology for the Johns Hopkins All Children’s Institute for Brain Protection Sciences. He sees patients at the main campus in St. Petersburg and at Johns Hopkins All Children’s Outpatient Care, North Port. He joined the hospital staff in 2018. Dr. Geller previously was a pediatric neurologist and child neurology residency program director at Cardinal Glennon Children's Medical Center in St. Louis, Missouri. He retired as a captain from the U.S. Navy Medical Corps. His clinical and research interests include neurofibromatosis, neuro-oncology and pain management. Dr. Geller earned his medical degree from St. Louis University Medical School. He trained in pediatrics and served as chief resident at Naval Hospital in Oakland, California. He then completed a pediatric neurology residency and served as chief neurology resident at the University of Illinois in Chicago. He also completed a six-week externship at Queen Square Neurologic Institute in London, England. Dr. Geller is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). His top areas of expertise are Cerebral Ventricle Cancer, Neurofibromatosis Type 1 (NF1), Neurofibromatosis, and Duchenne Muscular Dystrophy.

Dr. Stapleton is the division chief of oncology and director of pediatric neuro-oncology at Johns Hopkins All Children’s Hospital. Dr. Stapleton joined the hospital in 2007. She has formal training in pediatric neuro-oncology. She received the Armstrong Award for Quality and Patient Safety for Johns Hopkins All Children's in the 2024 Johns Hopkins Medicine Clinical Awards. Dr. Stapleton is on the Pediatric Palliative Care Team at Johns Hopkins All Children’s, and she specializes in symptom control and end of life care. She has been awarded numerous grants for phase I studies for patients with brain and spinal cord tumors as well as clinical research in pediatric palliative care. Dr. Stapleton’s research experience includes investigator-initiated and multi-center research projects. Dr. Stapleton is an associate professor of pediatrics at the University of South Florida and an assistant professor in the department of pediatrics at Johns Hopkins University. Dr. Stapleton completed her medical training at St. Louis University School of Medicine, residency training at Lackland Air Force Base in Texas and fellowship training at Baylor College of Medicine/Texas Children’s Hospital. Dr. Stapleton also served 13 years in the United States Air Force. Dr. Stapleton is a member of the American Board of Pediatrics, the Children’s Oncology Group, the Society of Neuro-Oncology, American Society of Pediatric Hematology/Oncology, and America Academy of Hospice and Palliative Medicine. Dr. Stapleton is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). Her top areas of expertise are Medulloblastoma, Embryonal Tumor with Multilayered Rosettes, Glioma, Histiocytosis, and Bone Marrow Aspiration.

Dr. Crenshaw is the medical director for the Clinical Genetics Program at Johns Hopkins All Children’s Hospital and also serves as an assistant professor with Johns Hopkins Medicine. Her research interests include congenital heart defects, chromosome abnormalities and Turner Syndrome. She has additional expertise in the genetics of congenital heart disease and connective tissue disorders. After graduating from Cornell University as a Cornell National Scholar and Hughes Research Scholar, Dr. Crenshaw received her medical degree from the State University of New York Health Sciences Center at Syracuse. She completed a pediatrics residency at Inova Fairfax Hospital for Children in Falls Church, VA (a teaching affiliate of the University of Virginia), followed by a three-year medical genetics training program at Johns Hopkins University’s McKusick-Nathans Institute of Genetic Medicine in Baltimore, MD. Dr. Crenshaw is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). Her top areas of expertise are Turner Syndrome, Intersex, Mosaicism, and Cleft Lip and Palate.

Claudia Lukas is a Physician Assistant in Saint Petersburg, Florida. Ms. Lukas is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). Her top area of expertise is Neurofibromatosis Type 1 (NF1).

Dr. Cruz Flores is a pediatric oncologist at Johns Hopkins All Children’s. She joined the hospital staff in 2020. She earned her medical degree from the University of Puerto Rico School of Medicine. She completed an internship and residency in pediatrics at the University of Puerto Rico School of Medicine, where she also served as chief resident. She completed a fellowship in pediatric hematology-oncology at Louisiana State University Health Sciences Center/Children’s Hospital New Orleans, followed by a fellowship in pediatric neuro-oncology at Johns Hopkins All Children’s. . Her top areas of expertise are Immune Thrombocytopenic Purpura (ITP) and Neurofibromatosis Type 1 (NF1).

Dr. Schallert specializes in pediatric radiology at Johns Hopkins All Children’s Hospital. She joined the medical staff in 2022 and sees patients on our main campus in St. Petersburg, Florida. Dr. Schallert?earned her medical degree from the University of Florida College of Medicine in Gainesville, Florida. She completed an internship at John Peter Smith Hospital in Fort Worth, Texas. She then completed a residency in diagnostic radiology from the University of Miami, Miller School of Medicine, Jackson Memorial Hospital in Miami, followed by a pediatric radiology fellowship at Baylor College of Medicine, Texas Children’s Hospital in Houston. Dr. Schallert is conversational in Spanish. . Her top areas of expertise are SVC Obstruction, Kienbock's Disease, Collins Pope Syndrome, and Neurofibromatosis Type 1 (NF1).

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. . Her top areas of expertise are Acute Lymphoblastic Leukemia (ALL), Immune Thrombocytopenic Purpura (ITP), and Neurofibromatosis Type 1 (NF1).

Dr. Keup specializes in pediatric radiology at Johns Hopkins All Children’s Hospital. He joined the hospital staff in 2019. Dr. Keup also serves in the U.S. Army Reserve. He is currently attached to the Army Medical Department Personnel Management Command in Forest Park, Georgia, and is a Lieutenant Colonel in the Medical Corps. Dr. Keup earned his medical degree from the University of Missouri in Columbia, Missouri. He completed an internship in internal medicine from the University of Missouri-Kansas City in Kansas City, Missouri, followed by a residency in diagnostic radiology from the University of Missouri-Kansas City and a fellowship in pediatric radiology from Children’s Mercy Hospital in Kansas City, Missouri. . His top areas of expertise are Corpus Callosum Agenesis, Lung Nodules, Visceromegaly, and Gas Bloat Syndrome.

Dr. Quintana is a radiologist at Johns Hopkins All Children’s Hospital. He joined hospital staff in 2010. Dr. Quintana earned his medical degree at the University of South Florida. He trained in general pediatrics at Jackson Memorial Hospital/University of Miami and completed a diagnostic radiology residency at Geisinger Medical Center in Danville, Pennsylvania. Dr. Quintana completed a pediatric radiology fellowship at Children’s Hospital of Philadelphia. He is fluent in Spanish. . His top areas of expertise are Congenital Unilateral Pulmonary Hypoplasia, Colonic Malakoplakia, and Neurofibromatosis Type 1 (NF1).

David Manning is a Radiologist in Saint Petersburg, Florida. Dr. Manning has been practicing medicine for over 17 years and is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). His top areas of expertise are X-Linked Lymphoproliferative Disease, Urachal Cyst, Neurofibromatosis, and Peritonitis.

Esperanza Pacheco is a Pediatric Radiologist in St Petersburg, Florida. Dr. Pacheco is rated as an Experienced provider by MediFind in the treatment of Neurofibromatosis Type 1 (NF1). Her top areas of expertise are Spinal Tumor and Neurofibromatosis Type 1 (NF1).

Susan Samlaska is an Anesthesiologist in Saint Petersburg, Florida. Her top areas of expertise are Sacroiliac Joint Disease, Pudendal Neuralgia, Giant Axonal Neuropathy, and Wallerian Degeneration.

Michael Scannon is a Dermatologist in Tampa, Florida. His top areas of expertise are Neurocutaneous Melanosis, Giant Congenital Melanocytic Nevus, Giant Congenital Nevus, and Familial Atypical Multiple Mole Melanoma Syndrome.