Dr. O'Hara graduated with highest honors from Bryn Mawr College, as part of the Alpha Omega Alpha Honor Society from the University of Pennsylvania School of Medicine. She earned her Master's degree in Public Health from the University of Pittsburgh, and completed her residency, chief residency and general pediatric fellowship at the University of Pittsburgh.

Before she began her medical career, Dr. O'Hara taught children with autism. From 1993 to 1998 Dr O'Hara was a practicing general pediatrician and partner in a group practice. In 1999, she began her consultative, integrative practice for children with special needs, dedicating her practice to treating children with neurodevelopmental disorders, ADHD, PANS/PANDAS and BGE, OCD, Lyme, and Autism Spectrum Disorder.