Dr. Chandler is chief of the Division of Pediatric Surgery and the Pediatric Surgery Fellowship Program Director at Johns Hopkins All Children’s Hospital. She joined the medical staff in 2008, became interim chief in 2020 and was named full-time chief in 2021. She also is an associate professor of Surgery at the Johns Hopkins School of Medicine. Dr. Chandler’s clinical and research areas of interest are minimally invasive surgery including pectus excavatum, and pediatric cancer surgery. She is a member of the American College of Surgeons. Dr. Chandler was named Johns Hopkins All Children’s Hospital physician of the year in the 2017 Johns Hopkins Medicine Clinical Excellence Awards. Dr. Chandler earned her medical degree from the University of Massachusetts Medical School, Worcester, where she completed her general surgical residency. She completed a research fellowship in surgery at Beth Israel Deaconess Medical Center, Harvard Medical School, and was principal investigator for a grant that focused on overcoming chemoresistance in pancreatic cancer. She also completed a fellowship in pediatric surgery at The Johns Hopkins Hospital and School of Medicine in Baltimore, Maryland, with training in laparoscopic and advanced miniature access surgery. Dr. Chandler is rated as a Distinguished provider by MediFind in the treatment of Pectus Excavatum. Her top areas of expertise are Appendicitis, Pectus Excavatum, Viral Gastroenteritis, Appendectomy, and Endoscopy.

Dr. Snyder is a pediatric surgeon at Johns Hopkins All Children’s Hospital. He is the director of the pediatric surgery research program and the medical director of the pediatric trauma program at the Johns Hopkins All Children’s Hospital. He joined the medical staff in 2018. After earning his medical degree from the University of Florida, Dr. Snyder completed a research fellowship, Master of Science in Public Health degree, and residency in general surgery at the University of Alabama at Birmingham. He completed his clinical fellowship in pediatric surgery at Johns Hopkins All Children’s Hospital. Dr. Snyder previously served as a staff surgeon in the U.S. Air Force, performing general, trauma and acute care surgery for adults and children. His military service included assignments to Anchorage, Alaska, and Tampa, Florida, as well as overseas deployments. In conjunction with his military service, he has held adjunct clinical faculty positions with the University of Washington, Pacific Northwest University of Health Sciences, and the University of South Florida. He received an honorable discharge in 2016. Dr. Snyder’s clinical and research interests include neonatal thoracic and gastrointestinal surgery, comparative outcomes research, pediatric trauma systems, minimally invasive surgical techniques, and extracorporeal membrane oxygenation (ECMO). Dr. Snyder is rated as an Advanced provider by MediFind in the treatment of Pectus Excavatum. His top areas of expertise are Pectus Excavatum, Hernia, Omphalocele, Thyroidectomy, and Endoscopy.

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. Danielson is rated as an Advanced provider by MediFind in the treatment of Pectus Excavatum. His top areas of expertise are Appendicitis, Pectus Excavatum, Omphalocele, Appendectomy, and Endoscopy.

William Adamson is a Pediatric Surgeon and a General Surgeon in St Petersburg, Florida. Dr. Adamson is rated as an Advanced provider by MediFind in the treatment of Pectus Excavatum. His top areas of expertise are Pectus Excavatum, Pectus Carinatum, Hirschsprung Disease, and Total Intestinal Aganglionosis. Dr. Adamson is currently accepting new patients.

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 Pectus Excavatum. Her top areas of expertise are Scoliosis, Osteochondritis Dissecans, Knock Knees, and Caffey Disease.

Caitlin Crosier is a General Surgeon in Saint Petersburg, Florida. Dr. Crosier is rated as an Experienced provider by MediFind in the treatment of Pectus Excavatum. Her top area of expertise is Pectus Excavatum.

Nebbie Walford is a Pediatric Surgeon and a General Surgeon in St Petersburg, Florida. Dr. Walford is rated as an Experienced provider by MediFind in the treatment of Pectus Excavatum. Her top areas of expertise are Van Der Woude Syndrome, Infantile Pyloric Stenosis, Umbilical Hernia, Appendicitis, and Appendectomy. Dr. Walford is currently accepting new patients.

Diana Marin is a Radiologist in Saint Petersburg, Florida. Dr. Marin is rated as an Experienced provider by MediFind in the treatment of Pectus Excavatum. Her top areas of expertise are Familial Short Stature (FSS), Idiopathic Short Stature (ISS), Short Stature (Growth Disorders), and Scoliosis.

Amanda Zimmerman is a primary care provider, practicing in Internal Medicine in St Petersburg, Florida. Dr. Zimmerman is rated as an Experienced provider by MediFind in the treatment of Pectus Excavatum. Her top areas of expertise are Cholecystitis, Chronic Obstructive Pulmonary Disease (COPD), Lung Metastases, Ureteroscopy, and Endoscopy. Dr. Zimmerman is currently accepting new patients.

Sarah Jones-Sapienza is a General Surgeon and a Pediatrics provider in Clearwater, Florida. Dr. Jones-Sapienza is rated as an Experienced provider by MediFind in the treatment of Pectus Excavatum. Her top areas of expertise are Pectus Excavatum, Gastroschisis, Necrotizing Granuloma, and Retroperitoneal Inflammation.