Mary M. Johnson, M.D.
Oaklawn Medical Group-Inpatient Specialist
200 North Madison
Marshall, MI 49068
Dr. Mary M. Johnson earned both her bachelors's and medical degrees from the University of Michigan. She completed her residency in internal medicine at Rush-Presbyterian St. Luke's Medical Center in Chicago, Illinois. Dr. Johnson has served on the University of Michigan faculty in the Department of Internal Medicine. She is board certified in internal medicine. Dr. Johnson joined Oaklawn's active medical staff in December 2008.