Compassionate, thoughtful, and deeply rooted in whole-child care, Kathleen “Sissy” O’Reardon brings a calming presence and integrative approach to every family she serves. As a Pediatric Nurse Practitioner, she blends traditional pediatric medicine with root-focused, holistic support to help children thrive physically, emotionally, and developmentally. She works collaboratively with families on individualized care plans that honor the nervous system, lifestyle, nutrition, emotional wellness, and the unique needs of each child.

Sissy’s path into holistic pediatrics is deeply personal. As a former patient of Dr. Cannizzaro, she experienced firsthand the power of whole-body, relationship-centered care. That experience later came full circle when she completed her Nurse Practitioner training under his mentorship, profoundly shaping her philosophy of practice and inspiring her commitment to integrative, root-focused healing. Today, she remains deeply dedicated to carrying forward Dr. Cannizzaro’s legacy of thoughtful, compassionate, and whole-person care.

Her nursing career spans acute, inpatient, and outpatient pediatric settings, along with specialized experience in pediatric neurology, autism, and neuromuscular disorders. These diverse clinical experiences allow her to approach each child with both medical expertise and deep empathy.

Sissy is honored to continue the legacy of care established by Gail Ezell, NP, who has recently retired after decades of devoted service. Gail and Sissy first worked together over a decade ago at Nemours, completing their onboarding together while serving in different departments. Their shared commitment to whole-child care, integrity in practice, and compassion for families created a natural foundation for this thoughtful transition.

As both a provider and a mother of four, Sissy understands the vulnerability and strength that coexist in parenting. Families often describe her as a deeply present listener who creates a safe space where they feel heard, validated, and supported. Her care is guided by faith, compassion, curiosity, and a belief that healing happens best when children feel secure and families feel empowered.

Sissy holds a Doctor of Nursing Practice degree and is a Certified Pediatric Nurse Practitioner. She is passionate about helping families build long-term wellness, not quick fixes, and feels honored to walk alongside parents during some of their most meaningful and challenging seasons.