Leonard A. Schmidtner, born Leonard Kowalski, was a Polish architect who moved to Milwaukee, Wisconsin, and designed the former Milwaukee County Courthouse,Kathryn Bishop Eckert, The Sandstone Architecture of the Lake Superior Region, pp. 16–17.Thaddeus Borun, ed., We, the Milwaukee Poles: The History of Milwaukeeans of Polish Descent and a Record of Their Contributions to the Greatness of Milwaukee. Nowiny Pub. Co., 1946, original from the University of Michigan, digitized 24 Sep 2008, 290 pp. a bell tower for Holy Trinity Church (1862) on South 4th and West Bruce Streets, and St. Stanislaus Catholic Church.Jennifer Watson Schumacher, German Milwaukee, pp. 12–13. He was one of the first Poles in the city, spoke German, and adopted the name Schmidtner (Polish "Kowal" is German "Schmidt") to help establish himself.

Projects Davis Dry goods store (1860)Iron Block, HABS No. WTS-251, 205 East Wisconsin Avenue bell tower (1862) for Holy Trinity Roman Catholic Church at 605 South 4th and West Bruce Streets in Milwaukee. Listed on the National Register of Historic Places. St. Stanislaus Catholic Church at 1681 South 5th Street in Milwaukee. Renovated 1962 and gold leaf applied to domes. former Milwaukee County Courthouse

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