Dr. John Marohn was born in St. Joseph. He graduated from Findlay Senior High School in Findlay, OH, in 1984. He was a Magna Cum Laude graduate in 1988 from Hillsdale College in Hillsdale, MI, with a B.S. degree in biology. In 1991, Dr. Marohn graduated with highest distinction from the Michigan College of Optometry, Ferris State University, in Big Rapids, MI where he was inducted into the Beta Sigma Kappa optometric honor fraternity. Dr. Marohn completed a one-year contact lens residency in 1992 at the University of Missouri, College of Optometry, in St. Louis, MO.
He is a member of the American Optometric Association, Michigan Optometric Association, Fellowship of Christian Optometrists and a fellow in the American Academy of Optometry.
Dr. Marohn's wife, Susan, graduated from Indiana University with a degree in elementary education. They have two sons, Nathan and Jacob. Dr. Marohn and his family attend First Church of God in St. Joseph.