Princeton Nassau Pediatrics clouds
Appointments: Princeton (609) 924-5510 Monroe (609) 409-5600
  West Windsor (609) 799-5335 Pennington (609) 745-5300
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Our Physicians

Valerie Kullmann, MD

Valerie Kullmann, MD Dr. Kullmann joined PNP in 1993. She completed her pediatric residency from the University of Medicine and Dentistry of New Jersey - Robert Wood Johnson in New Brunswick , NJ . Following residency, she served as chief resident at Robert Wood Johnson. Dr. Kullmann earned her medical degree from the University of Medicine and Dentistry of New Jersey - Robert Wood Johnson Medical School in New Brunswick . She received her undergraduate degree from Rutgers University with a major in biochemistry. Dr. Kullmann is board certified in pediatrics and is a fellow of the American Academy of Pediatrics. She lives in West Windsor with her husband and four children, and in her free time enjoys skiing, tennis, boating, and coaching cheerleading.

Ji Yong Kong, MD

Ji Yong Kong, MD Dr. Ji Yong Kong joined PNP in July 2013. She completed her pediatric residency training at St. Christopher's Hospital for Children in Philadelphia. Dr. Kong received her medical degree from UMDNJ- New Jersey Medical School in Newark. She graduated cum laude with a BA in Neuroscience and Behavior from Barnard College, Columbia University in New York. Dr. Kong is board certified in Pediatrics and is a Fellow of the American Academy of Pediatrics. She enjoys traveling, reading, yoga, spending time with her family and dog, and participating in medical mission trips. Dr. Kong lives in West Windsor with her husband.

Bert Mandelbaum, M.D.

Bert Mandelbaum, M.D. Dr. Mandelbaum was recently re-appointed Chairman of the Department of Pediatrics at the University Medical Center at Princeton.  Dr. Mandelbaum is responsible for the oversight of pediatric care at the medical center and the joint venture between the Children's Hospital of Philadelphia and University Medical Center at Princeton.  He will continue his busy clinical practice with Princeton Nassau Pediatrics while serving as chairman.  Dr. Mandelbaum joined PNP in 2001, after completing his pediatric residency in New York City at New York Hospital - Cornell Medical Center where he also served as the chief resident of pediatrics. Dr. Mandelbaum received his medical degree from the University of Medicine and Dentistry of New Jersey - Robert Wood Johnson Medical School in New Brunswick. He obtained his undergraduate bachelor's degree in computer science at Rutgers University. Dr. Mandelbaum is board certified in pediatrics and is a fellow of the American Academy of Pediatrics. He grew up in Manalapan, NJ, and is an avid Yankees fan. He lives in Montgomery with his wife and two children.

Rebecca Marshall, M.D.

Rebecca Marshall, M.D. Dr. Marshall joined PNP in 1998. She completed her pediatric residency at Duke University Hospital in North Carolina. After residency, she completed two years of a fellowship in pediatric hematology/oncology before deciding to move to New Jersey to practice general pediatrics. Dr. Marshall received her medical degree from Pennsylvania State University College of Medicine in Hershey, Pennsylvania. She obtained her undergraduate degree from Georgetown University in Washington, D.C. with a major in English and a minor in biology. Dr. Marshall is board certified in pediatrics and is a fellow of the American Academy of Pediatrics. She enjoys tennis, singing, swimming, musicals, and reading. She would have more time for these hobbies if not for chasing around her two young children. She lives in Montgomery with her husband and two children.

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