Dr. Mark Rassier was raised on a farm in Northern Minnesota. During his childhood, his parents started and ran several businesses, including school busses, road construction, logging, and a snowmobile dealership. Mark eventually went to college and on to medical school. He trained and was on staff at Mayo Clinic, in Rochester, MN. He moved his nephrology practice to Marshfield Clinic in Minocqua in 1995. As of 2019, Dr. Rassier has been back to wrenching at Minocqua Tire & Auto.