He is affiliated with Aurora West Allis Medical Center and Children's Hospital of Wisconsin. He is a graduate of Medical College of Wisconsin. Dr. Hartmann's residency was performed at Children's Hospital of Wisconsin. Dr. Hartmann is in-network for several insurance carriers, including Humana HMO, Humana Bronze, and Humana Catastrophic. He has received professional recognition including the following: Best Doctors in America. His practice is open to new patients.