John Hugh MacMillan Sr. (August 11, 1869 – October 20, 1944) was an American businessman, president of Cargill from 1909 to 1936.
John Hugh MacMillan was born in La Crosse, Wisconsin, the son of Duncan McMillan, a director of the State Bank of La Crosse, and Mary Jane McCrea.
[1] At age 15, MacMillan started work at the State Bank of La Crosse, where his father was a director.
[2] Following a heart attack, his son, John H. MacMillan Jr. took over as president in 1936, and remained in post until his death in 1960.
[4][3] Both he and his wife are buried at Oak Grove Cemetery, La Crosse, Wisconsin.