Marisol Betensky, MD

Dr. Danielson is associate dean of clinical affairs at Johns Hopkins All Children’s Hospital. Dr. Danielson also began serving as president of All Children’s Specialty Physicians (ACSP) in 2023, first on an interim basis and then permanently. A clinical professor of surgery, he has chaired the Johns Hopkins All Children's Department of Surgery since 2020 and was interim chair from 2018 to 2020. He specializes in general surgery and was an early adopter of minimally invasive surgical techniques, developing expertise in treating chest wall deformities.Dr. Danielson founded the first fellowship sponsored by Johns Hopkins All Children’s Hospital in pediatric surgery and was also instrumental in bringing the National Quality Improvement in Surgery Program to the institution. He was named Johns Hopkins All Children’s Hospital physician of the year in the 2015 Johns Hopkins Medicine Clinical Awards. He joined the hospital staff in 2008.He retired as a colonel from the U.S. Army Reserve in 2017 after serving in both Iraq and Afghanistan.Dr. Danielson earned his medical degree from the University of Rochester where he also completed the residency program in general surgery through Strong Memorial Hospital. He completed a research fellowship in pediatric surgery at Massachusetts General Hospital/Harvard University and a clinical fellowship in pediatric surgery at Children’s Hospital Los Angeles. Before joining Johns Hopkins All Children’s, he served as director of pediatric surgical oncology at the University of Massachusetts.

Dr. Jordan Halsey holds an undergraduate degree in biochemistry from Lee University. She graduated with high honors from the University of Tennessee College of Medicine, receiving a doctorate of medicine. She completed a residency in integrated plastic surgery at Rutgers-New Jersey Medical School, then subsequently completed an additional fellowship in pediatric plastic and craniofacial surgery at Nationwide Children Hospital-Ohio State University.She joined the Johns Hopkins faculty in 2021 as a pediatric craniofacial surgeon in the Johns Hopkins All Children’s Hospital Division of Pediatric Plastic Surgery. Dr. Halsey has served the community in many volunteer and mentorship roles and is a recipient of many awards. She is active in clinical research and has a passion for medical missions.

Dr. Borrero-Mejias is a child neurologist in the Johns Hopkins All Children's Institute for Brain Protection Sciences. She joined the hospital staff in 2021. Her clinical expertise includes pediatric headache, epilepsy and tic disorders. She also serves as program director of the Johns Hopkins All Children's Child Neurology Residency program. Dr. Borrero-Mejias sees patients at our main campus in St. Petersburg and at our Outpatient Care locations in Tampa and Brandon. Before joining the hospital, she served as a clinical assistant professor at the University of Arizona College of Medicine-Phoenix. She was also a child neurologist at Barrow Neurological Institute at Phoenix Children’s Hospital in Phoenix, where she mentored medical students, residents and fellows. Dr. Borrero-Mejias earned her medical degree from the Universidad Central del Caribe, School of Medicine in Bayamón, Puerto Rico. She completed a pediatric residency at the University of Puerto Rico-School of Medicine in San Juan, Puerto Rico, followed by a pediatric neurology residency at Barrow Neurological Institute at Phoenix Children’s Hospital and St Joseph’s Hospital and Medical Center in Phoenix.