About Ashley M. Gefen, MD

Ashley Gefen, MD, is a pediatric nephrologist specializing in genetic kidney disease, tubular disorders and kidney stone disease. Opportunities for growth and innovation led Dr. Gefen to Phoenix Children's.

Through her own childhood experience, Dr. Gefen understands how scary it can feel to have an illness and need medical care. She wanted to be a person others could rely on when they were in need. After earning her medical degree at Washington University School of Medicine in St. Louis, Dr. Gefen completed her pediatrics residency at New York University Hospitals/Hassenfeld Children's Hospital/Bellevue Hospital in New York. She completed a pediatric nephrology fellowship at Northwell Health/Cohen Children's Medical Center in Queens, New York, and earned a master's degree in clinical research at Drexel University College of Medicine in Philadelphia.

Dr. Gefen is certified by the American Board of Pediatrics and is a fellow of the American Academy of Pediatrics. She's a member of numerous professional organizations, including the American Society of Transplantation, the American Society of Pediatric Nephrology and the National Kidney Foundation. Dr. Gefen also co-chairs the tubular/genetic/congenital kidney disease committee of the Pediatric Nephrology Research Consortium.

Understanding the importance of research in making discoveries to detect and treat kidney conditions, Dr. Gefen is active in research and publishing in professional journals. She was awarded the Renasight Innovation Award to help fund her research on pediatric genetic kidney diseases.

Because every child is different, Dr. Gefen provides individualized care. She believes families know their child best and includes them as an essential part of the child's health care team.

When she's not working, Dr. Gefen enjoys traveling, cooking, baking and trying new foods.

Medical School / Education

Washington University School of Medicine, St. Louis, MO


(Pediatrics) New York University Hospitals/Hassenfeld Children's Hospital/Bellevue Hospital, New York, NY


(Pediatric Nephrology) Northwell Health/Cohen Children's Medical Center, Queens, NY


American Board of Pediatrics

Renasight Innovation Award, 2021

Professional Affiliations

Member, National Kidney Foundation

Fellow, American Academy of Pediatrics

Member, American Society of Transplantation

Member, American Society of Pediatric Nephrology

Co-chair, Pediatric Nephrology Research Consortium, Tubular/Genetic/Congenital Kidney Disease Committee

Gefen AM, Sethna CB, Cil O, Perwad F, Schoettler M, Michael M, Angelo JR, Safdar A, Amlie-Wolf L, Hunley TE, Ellison JS, Feig D, Zaritsky J. Genetic Testing in Children with Nephrolithiasis and Nephrocalcinosis. Pediatr Nephrol. 2023; Epub ahead of print. doi:10.1007/s00467-023-05879-0

Ramirez M, Chakravarti S, McKinstry J, Al-qaqaa Y, Sahulee R, Kumar TKS, Li X, Goldberg JD, Gefen AM, Malaga-Dieguez L. Elevated Levels of Urinary Biomarkers TIMP-2 and IGFBP-7 Predict Acute Kidney Injury in Neonates after Congenital Heart Surgery. J Pediatr Intensive Care. 2021;11(2):153-158. doi:10.1055/s-0041-1740359

Basalely A, Gurusinghe S, Schneider J, Shah SS, Siegel LB, Pollack G, Singer P, Castellanos-Reyes LJ, Fishbane S, Jhaveri KD, Mitchell E, Merchant K, Capone C, Gefen AM, Steinberg J, Sethna CB. Acute kidney injury in pediatric patients hospitalized with acute COVID-19 and multisystem inflammatory syndrome in children associated with COVID-19. Kidney Int. 2021;100(1):138-145. doi:10.1016/j.kint.2021.02.026

Gefen AM, Palumbo N, Nathan SK, Singer PS, Castellanos-Reyes LJ, Sethna CB. Pediatric COVID-19-associated rhabdomyolysis: a case report. Pediatr Nephrol. 2020;35(8):1517-1520. doi:10.1007/s00467-020-04617-0

Gefen AM, White AJ. Asymptomatic pulmonary arteriovenous malformations in children with hereditary hemorrhagic telangiectasia. Pediatr Pulmonol. 2017;52(9):1194-1197. doi:10.1002/ppul.23686


Our new doctor Gefen was great! She was very informative and patient.

We absolutely love Dr Gefen. She's on top of everything, super responsive and her bedside manner is so sweet/caring. We feel very lucky to have her as our son's nephrologist!

Dr. Gefen went above and beyond to treat my daughter.