Our specialists

Our caregiver team offers best-practice care that only a major center like ours can provide. Herma Heart Institute doctors are consistently ranked among The Best Doctors in America and offer some of the best outcomes in the nation. What’s more, we’re the only pediatric heart care program in Wisconsin where all caregivers are full-time fetal, neonatal and pediatric experts.


Children’s Wisconsin is committed to providing you the information you need to make informed decisions about your heart specialist. As part of that commitment, we post our patient satisfaction ratings within our provider profiles. To assist you on how we post ratings (and why there may not be ratings listed), we’ve developed this guide.


David Bergstand, MD

Ashlee Graham, DO

Brad Johnson, MD (Adult Congenital Heart Disease)

Cassandra Mejia, MD 

Felipe Murguia, MD

Megha Patel, DO

Ashley Phimister, MD 

Nicholas Rebhan, MD

Christopher Scott, MD

Tracey Thompson, MD

Become a patient or contact us

Contact us for more information about the Herma Heart Institute. Request an appointment online or call (414) 607-5280 or toll-free (877) 607-5280.

Request an appointment

Meet Michael Mitchell, MD

Michael E Mitchell

Michael Mitchell, MD
Surgical Director, Herma Heart Institute
Children's Wisconsin

Meet Dr. Mitchell