Robert Nunnemacher (April 7, 1854 – March 8, 1912) was a member of one of Milwaukee's pioneer families of Swiss origin. In the 1890s, Mr. Nunnemacher was among the twenty most successful and wealthiest businessmen in America. He is best known for the system of malting drum he developed. It involved a rotating drum and humidified air between a central duct, and other periphery ducts to condition germinating grain.
He was president and secretary of the Kraus Merkel Malting company of Milwaukee, and then went on to be founder and president of the Galland Henning Pneumatic Malting Drum Manufacturing Company of Milwaukee, Wisconsin, known today as Galland Henning Nopak, Inc., now in its 130th year of operation. The name stemmed from Mr. Nunnemacher's acquisition of the American manufacturing rights to equipment that originated from Nicholas Galland, a Frenchman, and a German named Julius Henning.
He was a member of the board of directors for First National Bank, the Milwaukee Mechanic's Insurance Company, the Prospect Hill Land Company, and board of trustees of Milwaukee Public Museum. He was also affiliated with the Merchants Exchange Bank and the American Malting Company in the 1890s.
Nunnemacher purchased Milwaukee and Superior Mining Company at sheriff sale which was located in the Gogebic Range.
Director of Twin Buttes Mining and Smelting located in Twin Buttes, Arizona.
His Milwaukee, Wisconsin residence at 2409 N. Wahl Avenue, Milwaukee, 1906. Symmetrical Jacobethan style, brick with stone quoins was designed by Alexander C. Eschweiler and was added to the NRHP in 2000.
The Nunnemacher Summer Clubhouse was in Pauline's Woods on Pine Lake, which is in Chenequa, Wisconsin.