Dr. Sonja A. Rasmussen

Dr. Cohen is Director of Pediatric Neuro-Oncology and Clinical Director of the Division of Pediatric Oncology at the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins. He received his undergraduate degree at Brown University and earned his MD at the Upstate Medical University, in Syracuse, NY. He did his general Pediatric Residency and Chief Residency at the University of Colorado and completed his Pediatric Hematology/Oncology Fellowship at Johns Hopkins. He has served on the faculty since 1994. His research centers on clinical trials of novel therapeutics for children with brain tumors. Dr. Cohen is co-chair of the High-Grade Glioma committee for the Children's Oncology Group and in that capacity has a particular research interest in the development of therapeutics for the treatment of infiltrating gliomas. He serves on the scientific advisory board for a number of organizations including St. Baldricks and the Childhood Brain Tumor Foundation. He is on the editorial board for PDQ with responsibility for authorship of the pediatric CNS brain tumor summaries. The Pediatric Neuro-Oncology program conducts a broad range of research centered primarily around the development and testing of novel therapeutics for children with brain tumors. The multidisciplinary nature of this work translates into continual collaboration with specialists in pediatric neurosurgery, radiation oncology, neuropathology, neuroradiology, neurology, neuro-ophthalmology, neuropsychology, and other related disciplines. Dr. Cohen is rated as a Distinguished provider by MediFind in the treatment of Hepatoblastoma. His top areas of expertise are Glioma, Brain Stem Cancer, Medulloblastoma, Embryonal Tumor with Multilayered Rosettes, and Bone Marrow Aspiration.

Michael Ortiz is a Pediatrics specialist and a Hematologist in Washington, Washington, D.c.. Dr. Ortiz is rated as a Distinguished provider by MediFind in the treatment of Hepatoblastoma. His top areas of expertise are Wilms Tumor, Renal Cell Carcinoma (RCC), Desmoplastic Small Round Cell Tumor, and Fibrolamellar Carcinoma.

Robyn Gartrell, MD, MS is a physician-scientist and pediatric oncologist who joined the faculty at Johns Hopkins University School of Medicine as Assistant Professor in January 2024. Dr. Gartrell completed her clinical pediatric hematology/oncology fellowship at New York Presbyterian / Columbia University Irving Medical Center (CUIMC), and a postdoctoral fellowship in Immunotherapy and Precision Medicine. She also completed a Master of Science in Patient Oriented Research as well as her first 5 years as faculty at CUIMC. Dr. Gartrell’s primary research focuses on combination approaches including radiation, chemotherapy, and other target agents with immunotherapy to improve response, increase survival, and decrease toxicity for children, adolescents, and young adults with cancer. Her laboratory uses advances in tumor immunology to develop more effective and more personalized therapies using multiplex platforms and immunogenomics to evaluate the tumor microenvironment and determine which pediatric tumor types, and which patients, will respond to immunotherapy. Dr. Gartrell is rated as an Advanced provider by MediFind in the treatment of Hepatoblastoma. Her top areas of expertise are Glioma, Diffuse Midline Glioma H3 K27M-Mutant, HER2 Negative Breast Cancer, and Pancreatic Ductal Adenocarcinoma.