
Leonard A. Schmidtner, born Leonard Kowalski, was a Polish architect who moved to Milwaukee, Wisconsin, and designed the former Milwaukee County Courthouse, a bell tower for Holy Trinity Church (1862) on South 4th and West Bruce Streets, and St. Stanislaus Catholic Church. 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.