John B. Kupfer (March 10, 1833 – September 9, 1897) was an American politician and businessman from Kenosha, Wisconsin, who served as the 30th mayor of Kenosha from 1890 to 1891 as a member of the Democratic Party.
Business career John Kupfer came from the Kingdom of Bavaria. In 1859, Kupfer established a bakery that would become the Kupfer Cracker Company. He is noted as the inventor of the Kenosha Cracker.
Political career As mayor, John oversaw the construction of Kenosha’s sewer system, grading of streets, and organizing of a formal police force. He also oversaw the construction of Kenosha's high school and fire house. In addition to serving as mayor, Kufper served a five-year term as county supervisor of Kenosha County, Wisconsin. Politically, he was a Democrat.
Personal life John Kupfer's son, William Kupfer, married Philomena Pirsch, sister of fire apparatus inventor Peter Pirsch.
He died on September 8, 1897.
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