Thomas Dyer
Thomas Dyer served as mayor of Chicago, Illinois for the Democratic Party. He also served as the founding president of the Chicago Board of Trade.
He was a former meat-packing partner of former mayor John Putnam Chapin, who was one of Chicago's first meat packers. Chapin built a slaughterhouse on the South Branch of the Chicago River in 1844.
Running as a "pro-Nebraska" Democrat, Dyer won the contentious 1856 Chicago mayoral election, defeating former mayor Francis Cornwall Sherman.