Dr. Constantinos Kintiroglou earned his medical degree from the University of Athens School of Medicine in Greece and completed his pediatric and neonatal training at Saint Barnabas Medical Center and Beth Israel Medical Center in New Jersey. He has been board certified in Pediatrics since 1978 and in Neonatal-Perinatal Medicine since 1979.

With decades of experience caring for children and newborns, Dr. Kintiroglou is widely respected for his dedication to pediatric healthcare. Throughout his career, he has received numerous professional recognitions, including multiple “Top Docs” honors. Outside of medicine, he enjoys spending time with his wife, Dr. Marietta Kintiroglou, and their six grandchildren.

Dr. John Kintiroglou earned his undergraduate degree from Johns Hopkins University before receiving his medical degree from UMDNJ-Robert Wood Johnson Medical School. He completed his pediatric internship and residency at Robert Wood Johnson University Hospital and has been board certified in Pediatrics since 2000.

After completing his training, Dr. Kintiroglou joined his father in practice, continuing the family’s commitment to exceptional pediatric care. Throughout his career, he has earned recognition for his clinical excellence, including “Top Pediatrician” and “Top Docs” honors, and previously served as Clinical Chief of the Department of Pediatrics at Saint Barnabas Medical Center.

Dr. Kintiroglou lives locally with his wife, Irene, and their three daughters.

Dr. Lisa Pivawer earned her undergraduate degree from the University of Pennsylvania before receiving her medical degree from the New York College of Osteopathic Medicine. She completed her pediatric residency at North Shore University Hospital–Long Island Jewish Medical Center and has been board certified in Pediatrics since 2003.

After several years practicing in New York, Dr. Lisa joined Kintiroglou Pediatrics in 2007. She is dedicated to providing compassionate, personalized care and enjoys building lasting relationships with her patients and their families.

Outside of the office, Dr. Lisa enjoys spending time with her husband and three children, walking her dog Will, playing tennis, and cooking.

Dr. Elina Nachevnik joined Kintiroglou Pediatrics in 2011, bringing extensive experience in pediatric medicine and hospital-based care. She earned her medical degree from Russian State Medical University in Moscow and completed her pediatric residency training at Children’s Hospital and Medical Center in Moscow and Lincoln Medical Center, affiliated with Weill Medical College of Cornell University, in New York.

Board certified in Pediatrics since 2004, Dr. Elina previously practiced as a Pediatric Hospitalist at Saint Barnabas Medical Center, where she earned multiple honors recognizing her dedication to patient care and medical education.

Outside of work, Dr. Elina enjoys spending time with her husband and their two daughters.

Dr. Christina Dooley joined Kintiroglou Pediatrics in 2018. She earned her Bachelor of Arts degree from Cornell University and her medical degree from UMDNJ-New Jersey Medical School. She completed her pediatric internship and residency at New York University Medical Center–Bellevue Hospital, followed by a fellowship in General Academic Pediatrics at New York University School of Medicine.

Board certified in Pediatrics since 2005, Dr. Christina is committed to providing thoughtful, comprehensive care to children and families. She lives in Bergen County with her husband and their three children.

Dr. Erik Dienna is a dedicated pediatrician who earned his medical degree from SUNY Downstate Medical Center and completed his pediatric residency at Cohen Children’s Medical Center. He is passionate about providing high-quality care to children of all ages and believes that strong partnerships with families are essential to helping young patients thrive.

As a husband and father of two, Dr. Dienna brings both professional expertise and personal understanding to his practice. He is committed to creating a supportive environment where children and families feel comfortable, heard, and confident in their care.

Dr. Rachelle Namm joined Kintiroglou Pediatrics in 2024, bringing nearly two decades of experience caring for children and families throughout New York and New Jersey. She is board certified in Pediatrics and a Fellow of the American Academy of Pediatrics.

Dr. Namm earned her undergraduate degree in Biology and Psychology with highest honors from Rutgers College and received her medical degree from Rutgers New Jersey Medical School. She completed her pediatric residency at Miami Children’s Hospital in Florida.

A Livingston native, Dr. Namm now lives locally with her husband and two children. Outside of the office, she enjoys swimming, singing, riding her Peloton, and visiting amusement parks, where her love of roller coasters is always on full display.