Meet the pediatricians

Dyan Sharone Hes, MD, FAAP

Consistently named one of New York’s Top Doctors by Castle Connolly since 2010, Dr. Dyan Hes was the founder and medical director of Gramercy Pediatrics in New York City. She served as Clinical Assistant Professor of Pediatrics at the Weill Medical College of Cornell University and at NYU Grossman School of Medicine. Dr. Hes joined Concorde Medical Group in February 2023 and she serves as director of pediatrics at Concorde.

Learn More About Dr. Hes

Daniel Wolloch, MD, FAAP

Daniel Wolloch earned his medical degree from Albert Einstein College of Medicine and then he completed his residency at NYU Bellevue in 1991. He then took time off to spend several years working tirelessly with his autistic son Zachary. After getting Zachary to a point where he was able to finally attend school, Dr. Wolloch then resumed his medical career, first for the Montefiore Medical Group and then at Pedimedica in Teaneck, New Jersey.

Learn More About Dr. Wolloch

Junko Nishita, MD, PhD

Dr. Nishita is a board-certified pediatrician in the United States and Japan, with an extensive career history in both countries as a physician as well as a researcher. Her professional background includes general pediatrics, pediatric cardiology, molecular biology, neuroscience, and related fields. After completing her pediatric residency in Brooklyn, she joined Gramercy Pediatrics, a private pediatric group practice in 2020 which became part of Concorde Medical Group in 2023.

Learn More About Dr. Nishita

Sophia Gigos-Costeas, MD, MPH, FAAP

Dr. Sophia Gigos-Costeas is a born and bred New Yorker who has lived her whole life in the New York Metro area. Prior to joining Gramercy Pediatrics, she worked at Children’s Aid in a variety of roles, including Medical Director, where she guided the Health and Wellness Division through much of the COVID pandemic.


Learn More About Dr. Gigos-Costeas

Karen Browner-Elhanan, MD, FAAP

Dr. Karen (KJ) Browner-Elhanan is board-certified in pediatrics with a subspecialty in adolescent medicine. She completed her medical training and pediatric residency at Tel Aviv University. Over the course of her career, Dr. Browner was a founder and division chief of several national academic departments of pediatric adolescent medicine and supported Gramercy Pediatrics since its inception as a clinical consultant. She also served as Chief Medical Officer for several national organizations, including the Indian Health Services in Nevada. In 2023, Dr. Browner joins Northwell Health, Concorde Medical Group Pediatrics as lead pediatrician for staff and faculty development of pediatric ambulatory services.

Learn More About Dr. Browner-Elhanan

Daniela Di Caro, DO

Dr. Daniela Di Caro is a pediatrician who provides primary care to children from birth through college. She graduated from Cornell University with a bachelors in Human Biology, Health, & Society and went on to earn her medical degree from NYIT College of Osteopathic Medicine. Dr. Di Caro completed her residency training in General Pediatrics at Northwell Cohen Children’s Medical Center, and she joined Concorde Medical Group Pediatrics in August 2023!

Learn More About Dr. Di Caro

Matthew Deng, MD

Dr. Matthew Deng is a general pediatrician and native-Texan who found his way to New York City. He completed his undergraduate studies in Biology at the University of Texas at Dallas and pursued his medical degree at the University of Texas Health Science Center at San Antonio. Afterwards, he moved to Manhattan for his pediatric residency at the Icahn School of Medicine at Mount Sinai, where he earned recognition with the Donald and Irwin Gribetz Excellence in Primary Care Award.

Learn More About Dr. Deng

Gramercy Pediatrics was founded in 2010 and has been serving children and adolescents in the downtown New York City area for the past 13 years. Our physicians are excited to join Northwell Health and to continue to provide the highest level of primary care for our patients in Manhattan. We are looking forward to being part of a new network of pediatric specialty providers and to seeing babies in the Lenox Hill nursery!

Gramercy Pediatrics continues to serve the needs of our patients in our new partnership with Northwell Health, Concorde Pediatrics



Our Locations



To reach us at any of our locations, our number is (212) 473-4200