Our Staff

Dr. Greg Garrison

Dr. Garrison has been practicing pediatrics since 1996.  After receiving his Bachelor of Arts in Communication from Judson College he pursued other undergraduate work in Chemistry and Biology at St. Louis University and Southern Illinois University – Edwardsville. He received his Medical Degree from Southern Illinois University in 1993 and completed his pediatric residency at Arkansas Children’s Hospital in Little Rock, Arkansas in 1996. He spent 3 years working as a general pediatrician at the Sherwood Family Medial Clinic in Sherwood, Arkansas. In 1999, he moved to southern Illinois and founded St. Clair Pediatrics. Dr. Garrison is a member of the St. Clair Medical Society, the Illinois State Medical Society, the American Medical Association, and the American Academy of Pediatrics. He lives in O’Fallon with his wife and is the proud father of two daughters.

Kelly Harres, CPN

Kelly began her career as a pediatric registered nurse in 2008 at St. Louis Children’s Hospital on a medical-surgical floor where she followed a passion in trauma and burn care. She received her Associates of Science in Nursing in 2008 and her Bachelors of Science in Nursing in 2010 from Goldfarb School of Nursing at Barnes-Jewish College. She received her Masters in Science of Nursing from Saint Louis University in 2015 with a focus on Pediatric Primary Care. She is board-certified by the Pediatric Nursing Certification Board and a member of the National Association of Nurse Practitioners. Kelly is also a Wound Care Certified Nurse. She was born and raised in the St. Louis area and now resides Columbia, IL with her husband Scott, daughter Hazel, and dog Tootie.

Brittanie Bardon, CPNP 

Brittanie grew up in Kansas City, MO and attended college at the University of Missouri – Columbia. She received her Bachelor of Science in Biology in 2010, going on to obtain her Bachelor of Science in Nursing through the Accelerated Program at Sinclair School of Nursing in 2011. She always had a passion for pediatrics and was thrilled to become a pediatric registered nurse just after graduation at SSM Health Cardinal Glennon Children’s Hospital on the infant/toddler medical-surgical floor. She then received her Masters of Science in Nursing with focus on Pediatric Primary Care from Saint Louis University in 2016. She is board-certified by the Pediatric Nursing Certification Board and a member of the National Association of Nurse Practitioners. She resides in the St. Louis area with her husband, Jeff, and adorable cat, Bruce Wayne, and in her free time enjoys cheering on the Blues and Cardinals!

Front Desk Staff

Lupi Castillo

Practice Manager

Laura Minor


Gina Davinroy


Angie Rednour


Victoria Tribout

Billing Representative

Nursing Staff

Dawn Honer


Natasha Kauling


Jessica Lamm


Diana Winchester


Erica Tiemann


Melissa Thole


What Our Families Are Saying

Hollie H.

Dr. Garrison and his staff are just the best!!!! I could not ask for a better pediatrician for my son!! I would highly recommend them to anyone! 

Catrina H.

We just switched to them and I’m so glad we did! The office is beautiful and clean and everyone there is very friendly and helpful.

Karen R.

As stressful as it can be to bring your sick child into the pediatrician’s office, the staff at St. Clair Pediatric’s always know how to provide a calm & comforting environment! The care provided by their staff is nothing short of spectacular.