As Chief Operating Officer of Phoenix Children's Medical Group (PCMG), Dr. Muenzer is accountable for the overall operations of more than 500 employed physicians and providers. He also spearheads the development, communication and implementation of effective growth strategies and process improvement for the medical group and associated service lines. Dr. Muenzer also provides administrative and clinical leadership to four clinical centers that encompass multiple divisions. These include the Center for Cancer and Blood Disorders, Emergency and Urgent Care services, Aerodigestive and Medical Subspecialties. Dr. Muenzer remains committed to Patient, Safety and Quality and has administrative oversight for these programs at Phoenix Children's Hospital.

Prior to this position, Dr. Muenzer served in the division of Emergency Medicine as a physician. He has also served as Medical Director of Phoenix Children's Medical Group, Associate Director of the Emergency Department, Program Director of the Pediatric Emergency Medicine fellowship program and Vice President of the Medical Staff.