Ronald Harold Johnson is the senior United States Senator from Wisconsin, a position he has held since 2011. A Republican, Johnson was first elected to the U.S.
Senate in 2010, defeating Democratic incumbent Russ Feingold. He was reelected in 2016 in a rematch against Feingold, and again in 2022, narrowly defeating Lieutenant Governor Mandela Barnes. Before entering politics, Johnson was the chief executive officer of a plastics manufacturer in Oshkosh, Wisconsin.