Johan Berger Mathiesen (13 November 1872[1][2] – 17 January 1923)[3][4] was a Norwegian-born doctor and surgeon who worked for most of his adult life in Wisconsin, United States.
[5] After finishing his degree in medicine at the university of Kristiania in 1898, he immigrated to America in spring 1900.
[6] He settled down in Eau Claire, Wisconsin, and lived there for the remainder of his life except for a period in 1902–1905.
[7] Once in Eau Claire, he teamed up with Norwegian-born doctor and surgeon Hans Christian Midelfart (1865–1937).
[12] Since both Johan Berger and his wife died within months of each other in 1923, the children became orphans at an early age.