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.

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!

Katherine ConklingCPNP

Katie grew up in Glen Carbon, IL and obtained her Bachelors of Science in Nursing from Goldfarb School of Nursing at Barnes-Jewish College in 2013.  She worked for 1 year on an adult orthopedic floor, and then pursued her passion for pediatrics at Cardinal Glennon Children’s Hospital.  She worked there for more than 4 years on the Infant/Toddler Medical/Surgical unit, and became a Certified Pediatric Nurse.  She completed her Masters of Science in Nursing, focusing on Pediatric Primary Care, from Maryville University in 2017.  She is a board-certified Pediatric Nurse Practitioner by the Pediatric Nursing Certification Board (PNCB), a member of the National Association of Pediatric Nurse Practitioners, and a member of Sigma Theta Tau International Honor Society of Nursing.  She is enjoying newlywed life with her sweet husband, Ben, and still resides in IL.  In her spare time enjoys hanging out with her family, listening to music, being outside, and swimming in her pool!  

Anna HarperCPNP

Front Desk Staff

Lupi Castillo

Practice Manager

Amy Maninno


Shana Hanley


Candace Jones


Nursing Staff

Savannah Loeffen


Melissa Thole


Paige Etling


Ashley Clinton


Morgan Schniers


Paula Dori


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.