Meet the Providers

Providence Columbia Medical Associates

Seasoned professionals who diagnose, treat, and help manage or prevent chronic illness

Vaughn Barnick, MD

Vaughn Barnick, MD Internal Medicine Doctor


Dr. Barnick received his medical degree from the Medical University of South Carolina and completed his residency in internal medicine at the University of Virginia Affiliated Hospitals. He is board certified in internal medicine by the American Board of Internal Medicine and has been in practice for 30 years, during which he has served Providence Hospitals in various leadership roles including Chief of Medicine, Chief of Staff, Board Member, and Medical Director of the Augustine Health Group (a position he still holds). He is the founding physician of Columbia Medical Associates and continues to practice full time in both outpatient and inpatient settings. Dr. Barnick is currently recognized by the National Committee for Quality Assurance for excellence of care in diabetes, cardiovascular and stroke diseases. He is a married father of two, who enjoys the outdoors, cooking, and traveling.

Jerry Robinson, MDJerry Robinson, MD Internal Medicine


Dr. Robinson received his medical degree from the Medical University of South Carolina in Charleston. His residency was completed in internal medicine at Wake Forest Baptist Medical Center in Winston Salem, NC. Board certified in internal medicine, he is a member of the College of Physicians and the American Medical Association, and he enjoys all areas of internal medicine with special emphasis on cardiology and gastroenterology.

Whitney Pitts Primary Care provider with Providence Columbia Medical AssociatesWhitney Pellicci Pitts, MSN, APRN, FNP-C 


Whitney Pitts earned her Bachelor of Science in nursing from The University of South Carolina and a Master of Science in nursing from Maryville University. Whitney brings a wide range of expertise in a variety of healthcare disciplines that include, adult primary care, pediatrics, women’s health and trauma. She resides in Swansea, SC with her family.

Casey Skinner, PA-C 

PHYSICIAN ASSISTANTCasey Skinner Primary Care Columbia SC

Casey Skinner, PA, is a Certified Physician Assistant providing Primary Care in Columbia, SC. She received her Masters of Physician Assistant (PA) Medicine from North Greenville University, and a Bachelor of Science in Biology and English from The University of South Carolina Honors College. In addition to internal medicine, which she specializes in at Providence Columbia Medical Associates, Casey's professional career includes experience in a wide range of specialties including: family medicine, urgent care, women's health, dermatology, mental health, pediatrics, general surgery and emergency medicine. 

Misty Polson, MSN, FNP-C 


Misty Polson, MSN, FNP-C is a Certified Family Nurse Practitioner. She earned a bachelor's of science in nursing from the University of South Carolina and a Master's of Science in Nursing from Chamberlain College of Nursing in Columbia, SC.  
In addition to internal medicine, Misty specializes in diabetes management, hypertension and general preventative medicine. Misty is currently accepting new patients. 

Lien Swieringa, MSN, FNP-C 


Lien Swieringa, MSN, FNP-C, is a licensed Family Nurse Practitioner providing primary care in Columbia, SC. She earned a Bachelor of Science in nursing from Hope College in Holland, MI, and a Master of Science in nursing from Frontier Nursing University in Hyden, KY. Lien is also a Registered Nurse in the State of South Carolina. Lien's professional experience includes family medicine, women's health, pediatrics, labor and delivery, orthopedics and medical-surgical inpatient nursing. She is particularly interested in the areas of Preventive Medicine and Women's Health. 

Call (803) 252-1953 to schedule an appointment with any of these providers.

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