Olivia Grace Williams, PA-C

Mark A. Meabe, MSPAS, PA-C, is a physician assistant at the Johns Hopkins All Children’s Cancer & Blood Disorders Institute, where he cares for hematology and oncology patients at the Outpatient Care Center in Tampa. He joined the hospital in 2024. Before joining Johns Hopkins All Children’s, Meabe served as a physician assistant with BayCare Medical Group in Tampa, where he gained specialized experience in both Pediatric Hematology and Oncology, as well as Pediatric Critical Care. This dual expertise has equipped him with a broad skill set, enabling him to manage a wide range of pediatric conditions, from cancer and blood disorders to life-threatening critical care situations. Meabe earned his bachelor’s degree in Biomedical Sciences from the University of South Florida in Tampa, followed by a master’s degree in Physician Assistant Studies from the South University PA Program in Savannah, Georgia. In addition to his clinical work, Meabe has a strong passion for academia and mentoring the next generation of healthcare professionals. He serves as an assistant clinical professor at the South University PA Program. He is also an active volunteer with the Leukemia and Lymphoma Society. Meabe is fluent in both English and Spanish.

Dr. Ruas specializes in plastic surgery and cleft and craniofacial surgery at Johns Hopkins All Children’s Hospital and is the director of plastic surgery resident education. He joined the hospital staff in 1990. He is a clinical professor in the Department of Surgery at the University of South Florida Morsani College of Medicine. Dr. Ruas earned his medical degree at the Johns Hopkins University School of Medicine and completed general and plastic surgery residencies at The Johns Hopkins Hospital. He completed a fellowship in maxillofacial trauma and microsurgical lower extremity reconstruction at The Maryland Institute of Emergency Medical Systems Services (MIEMSS) and a craniomaxillofacial surgery fellowship under Dr. Fernando Ortiz-Monasterio in Mexico City. Dr. Ruas is fluent in Spanish.