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Dr Elizabeth Vandergriff, MD

Dr. Vandergriff attended The University of Texas in Arlington, TX for her pre-medical degree. She received her medical degree and completed her residency at The University of Texas Health Center in San Antonio, TX. Dr. Vandergriff has been in private practice as a family physician since 1995. She enjoys all aspects of medicine from pediatrics to geriatrics.

Dr. Vandergriff is married with two children and 4 grandchildren. She enjoys crafts and singing.

Schquthia Peacock, FNP

Schquthia graduated from The University of North Carolina at Chapel Hill with a Bachelor of Science in Nursing. She worked as a Registered Nurse for 4 years before deciding to go back to UNC for a Masters Degree in Advance Practice Nursing. Schquthia has been in private practice as a Family Nurse Practitioner since 1999 in a practice she co-owns. She takes pleasure in caring for people of all ages, but she takes a particular interest in Women’s Health. 


In 2014, North Carolina Nurses Association named Schquthia “Practice Nurse of the Year.” She received the honor of Legislative Nurse of the year in 2017. Schquthia was also awarded the 2020 AANP State Advocate Award.  She also serves as adjunct faculty at University of North at Chapel Hill School of Nursing. 


Schquthia enjoys traveling with her husband. In her spare time, she advocates for patients and increased access to healthcare for all North Carolinians. She is active in the community and serves on numerous boards and committees focusing health and community service.

Melynda Smith, MSN,ANP-BC,FNP-BC

Melynda is double board certified as an Adult Nurse Practitioner and a Family Nurse Practitioner. Her background includes specialty training in gynecology and internal medicine. She brings over 24 years of experience in nursing.


Melynda graduated Cum Laude from Arizona State University with a Bachelor of Science in Nursing. Following graduation, she joined the U.S. Air Force Nursing Corps. She attained the rank of Captain and served five years on active duty. Melynda went on to receive a Master of Science in Nursing from Indiana University. She received the Academic Achievement Award for a 4.0GPA.


She is a mother of three boys and enjoys international travel, healthy cooking and exercising.

Katharine Mallory, FNP

It is bittersweet to say goodbye to those whom I have had the opportunity to care for during my time at Preston Medical Associates. I wanted to extend a personal thank you for selecting me to be your primary care provider over these past 5 years. It has been a joy and honor to work with each of you. Thank you for all that you have taught me during my time at the practice. As I transition into a different setting please know that there are four providers in the office that will gladly assist you with your healthcare needs. I wish you all a healthy and happy remainder of 2021.

Carolyn Berlin, FNP

Carolyn Berlin graduated with a masters degree in Trauma Nursing in 2004 from the University of Connecticut and practiced in the acute care setting (ER, ICU, Trauma Floor) and taught undergraduate nursing school over the past 20 years.

She obtained her Post-Masters Certificate from South University in 2018 as a Family Nurse Practitioner. Carolyn has presented at several national conferences on the acute care of the trauma patient admitted for observation and is published in the Journal of Trauma Nursing.

Carolyn lives in Cary with her husband, four children and three dogs. She loves spending time at her “happy place” on Ocean Isle Beach and enjoys reading and traveling with her family. She is very excited to continue her love for medicine at Preston Medical Associates.

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