Mary Sue Shannon is the wife of Milwaukee-area native and prominent University of Wisconsin alum Mike Shannon. Mike Shannon is a founding partner of KSL Capital Partners, a multibillion-dollar Denver private equity firm. The Shannons are major supporters of Republican candidates nationwide and often list their address as 2323 N. Mayfair Road, Wauwatosa, in an office building called the Heritage House at Mayfair. The building includes a first-floor Marine Bank branch and also is the home of Jacobus Wealth Management.