[1] After graduating law school, Fiedler was hired as an assistant district attorney in Waukesha County, Wisconsin.
In 1985, he moved back to Iowa County, Wisconsin, and set up a law firm partnership then known as Hamilton, Mueller, and Fiedler, in Dodgeville.
[1][2] In January 1987, Wisconsin's western district United States Attorney, John R. Byrnes, announced his resignation.
The Reagan administration accepted applicants for the position from Wisconsin attorneys, and Fiedler was quickly identified as one of the finalists.
[4] After accepting the job as U.S. attorney, Fiedler moved to Madison, Wisconsin—the location of the principal courthouse of the Western District of Wisconsin—where he has subsequently maintained his primary residence.
Fiedler announced his retirement from the court in September 2011, leaving office with a year left on his term.