Dr. Zumhagen graduated from Rockford College with a B.A degree in mathematics in 1980 and then attended the University of Illinois School of Medicine at Peoria, where he graduated in 1985. He then went on to complete his internship at McNeal Hospital Family Practice. He soon after started working at Homefirst Health Services, a Chicago-based physician home birth practice until 2010.

In 2009 Dr. Zumhagen founded Fearfully & Wonderfully Made, a holistic and nutritionally based center located in Orland Park, IL, where he currently practices. Dr. Zumhagen and his wife Virginia have nine children and 24 grandchildren. When he is not working, you can find Dr. Zumhagen spending time with his family, playing piano or trombone with some local groups or reading his Bible or a history book. You can also find him doing re-enactments of our 16th president, Abraham Lincoln.