Born in Germany in 1815, Janssen moved to
Mequon, Wisconsin in 1840. He was a delegate to the first Wisconsin Constitutional Convention in 1846 and served as Treasurer from 1852 to 1856. In 1853, he helped to build the
Concordia Mill, now listed on the
National Register of Historic Places. Later, he moved to
Cedarburg, Wisconsin and became Superintendent of Schools of
Ozaukee County, Wisconsin. He held the position until his death in 1877. ==References==