Dwayne Orville Andreas is one of the most prominent political campaign donors in the United States, having contributed millions of dollars to Democratic and Republican candidates alike. For twenty-five years, he was in the leadership of Archer Daniels Midland (ADM), the largest processor of farm commodities in the United States, where he made his fortune.

Andreas worked for a modest, family-owned food-processing firm in Cedar Rapids, Iowa. When Cargill bought the Cedar Rapids facility in 1945, Andreas joined the commodity firm, eventually becoming a vice president. Andreas resigned from Cargill in 1952, and continued in the vegetable oil business, eventually as an executive of the Grain Terminal Association.

In 1971 Andreas became Chief Executive Officer of ADM, and is credited with transforming the firm into an industrial powerhouse.