Mark has been a native of Morton since 1972. He graduated in 1975 from Morton High School and attended Illinois Central College before graduating from Mid-America College of Funeral Service in Indianapolis, Indiana, in 1980. He has been a licensed funeral director since 1981.
Mark is president of Knapp-Johnson Funeral Homes, Inc. which began operation in 1987. Mark is a past board president of the Illinois Funeral Directors Association District #8, Morton Chamber of Commerce, Morton Rotary Club and We Care, Inc. He was on the founding board of the Morton Community Foundation where he served as President. He served as a commissioner on the Morton Park District Board for 12 years. He was the 2005 recipient of the Morton Chamber Distinguished Service Award.
He resides in Morton with his wife, Kim. He has a son, Ryan (Katie) Johnson and two daughters, Sara (Greg) Roth and Anna Johnson. Mark has five grandchildren; Will, Grant and Audrey, children to Ryan and Katie, Nora and Tanner, children to Sara and Greg.
Mark and Kim are members of Blessed Sacrament Catholic Church in Morton.