Pediatrics Team in Perry Hall

Learn more about our Team

Tia Ragland Medley, MD, FAAP

Medical Director

Dr. Medley is a board-certified pediatrician who graduated from the George Washington University School of Medicine in Washington D.C. She completed her residency at the University of Maryland Medical System where she served as Chief Pediatric Resident for two years. Dr. Medley is a member of the American Academy of Pediatricians and a recipient of numerous honors and awards. She is passionate about volunteering and educating the community.

Ari Silver-Isenstadt, MD, FAAP

Dr. Silver-Isenstadt received his medical and education degrees from the University of Pennsylvania and completed his pediatric training at the University of Maryland. Board certified in pediatrics he has special interests in medical education, medical ethics and universal coverage for health.


Caren Williams, CRNP

Caren Williams is a board certified Pediatric Nurse Practitioner.  She received her Bachelor of Science, Master of Science and Pediatric Nurse Practitioner degrees at Johns Hopkins University School of Nursing. She also holds a Bachelor’s Degree in Biology from the University of Maryland. Mrs. Williams has extensive clinical experience in pediatric primary care. She is an active member of the National Association of Pediatric Nurse Practitioners and has interests in nutrition and promoting immunizations. 

Amanda M. Singh, CRNP, RN, BSN, BSc

Mrs. Singh is a nurse practitioner specializing in pediatric medicine. She is a graduate of the Johns Hopkins School of Nursing where she obtained her Bachelor of Science, Master of Science and Pediatric Nurse Practitioner degrees. Mrs. Singh has extensive clinical experience in treating pediatric cases both in the United States and internationally. Mrs. Singh also holds a Bachelor of Science in Psychology from Utah Valley University, a certification as an Emergency Medical Technician and has experience and interest in adolescent medicine and domestic violence.

Jessica Nooralian, MD

Jessica Nooralian, MD, earned her medical degree at the University of Maryland School of Medicine, and completed a pediatrics residency program at the  University of Maryland Medical Center. Throughout her training, Dr. Nooralian led and contributed to numerous medical research efforts in the Baltimore area. Most recently, she served as the lead researcher  for a study initiated by MedStar Franklin Square Medical Center, focused on how the Baby Friendly Initiative impacts full-term, healthy infants. Dr. Nooralian is certified in Pediatric Advanced Life Support and Neonatal Resuscitation by the American Heart Association and the American Academy of Pediatrics. She is a member of the American Academy of Pediatrics and the American Medical Association. 

Karen Clarke Markovic, PA-C

Karen Markovic is a board-certified physician assistant who cares for patients with acute illnesses and urgent care needs. She is a graduate of the University of Pittsburgh where she earned a Master of Science in Genetic Counseling degree after previously obtaining a Bachelor of Science in Physician Assistant Studies degree from Towson University. With a particular focus on acute and urgent care, her philosophy surrounds “management of acute illnesses and injury while avoiding overuse of unnecessary prescription medicine."


Contact Information

Phone: 443-725-2100

Fax: 877-423-2290

Complete a pre-visit questionnaire before you arrive. 

MedStar Franklin Square Pediatrics
5009 Honeygo Center Drive
Suite 225
Perry Hall, Maryland 21128 


Office Hours

Monday - Thursday, 9 a.m. - 7 p.m.
(Last patient accepted at 6:30 p.m.)

Friday, 9 a.m. - 4 p.m
(Scheduled Appointments)

Monday - Friday, 8:30 a.m. - 9 a.m.
(Walk-in acute visits only)

After-hours pediatric consults are available when the office is closed. Call 443-725-2100 and a pediatrician will return your call.

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