Marc C. Duff is a former member of the Wisconsin State Assembly.
Duff was born on July 4, 1961 in Port Washington, Wisconsin. He graduated from New Berlin Eisenhower Middle/High School in New Berlin, Wisconsin as well as the University of Wisconsin-Whitewater and the Robert M. La Follette Institute of Public Affairs at the University of Wisconsin-Madison. Duff is married with two children.
Duff was first elected to the Assembly in 1988. He was also a member of the Waukesha County, Wisconsin Board from 1988 to 1989. Duff was elected as a Republican.
Duff is currently the CFO of Racine Unified School District in Racine, Wisconsin.