Dr. Fergusson, Dr. Nguyen and Dr. Wallen feel that in order to provide the best possible medical care, a partnership must be formed between the physician and the family. They practice traditional medical care as supported by the American Academy of Pediatrics. They support the AAP’s immunization schedule and guidelines and believe that all children deserve the right to be free from preventable infectious diseases. They also believe that with every patient and every day, they continue to grow and learn. That’s why they actively teach nursing students, physician assistant students and pediatric residents in our community. They are also actively involved in research projects at Children’s National Medical Center. In the past, they have worked on projects related to pediatric obesity and population health on pediatric asthma.

Paula N. Fergusson, MD, FAAP

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Dr. Fergusson received her undergraduate degree from East Carolina University and her medical degree from the Medical College of Virginia. She completed her internship and residency at Children’s National Medical Center in Washington, D.C. She is board certified in Pediatrics and a Fellow of the American Academy of Pediatrics. She is a member of the American Medical Association, the Medical Society of Virginia, and the Northern Virginia Pediatric Society. Dr. Fergusson has been practicing in the Northern Virginia area for more than twenty years and founded KidsFirst Pediatrics in 2003. Dr. Fergusson is the current Chair of Pediatrics at INOVA Loudoun Hospital.  She practices all aspects of general pediatrics and has a special interest in developmental and behavioral pediatrics. She and her husband, Ernie, have two sons and a daughter. Her interests include reading, fitness and a variety of outdoor activities.


Tuc T. Nguyen, MD, FAAP

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Dr. Nguyen received her undergraduate degree from the University of Virginia in 1996. She then spent two years at the National Institutes of Health researching and managing clinical trials on pediatric obesity. She received her medical degree from the Virginia Commonwealth University School of Medicine in 2004 and completed her residency training at INOVA Fairfax Hospital for Children in 2008. She is board certified in Pediatrics and a Fellow of the American Academy of Pediatrics. She practices all aspects of general pediatrics and her special interests include childhood obesity and nutrition. She speaks Vietnamese and enjoys practicing yoga and the culinary arts. She and her husband, Daniel, have two sons and a daughter.



 Katie Wallen, MD, FAAP

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Dr. Wallen received her undergraduate degree from the University of Florida and attended Georgetown University for her medical degree. Her pediatric residency training was performed at the University of North Carolina Chapel Hill from 2006-2009. She went on to complete one year of clinical pediatric hematology-oncology fellowship also at UNC Chapel Hill Hospitals. Dr. Wallen is board certified by the American Board of Pediatrics and is a Fellow of the American Academy of Pediatrics. She feels strongly that every child deserves a healthy, full life and works together with her patients’ families to provide excellent care. Dr. Wallen enjoys all aspects of pediatric care and has special interest in blood disorders, anemia, and adoption/foster care. She speaks Spanish, enjoys an active lifestyle and spending time with her husband and two miracle kids!