Gustav was born in 1868 in Schleswig-Holstein, Germany. He immigrated to America as a child with his parents. In 1893, he married Louisa Elizabeth "Lizzie" Dohse in Clinton, Iowa. Gus passed away in 1947 in Clinton, Iowa.
Sources
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJH9-T35 : 25 September 2017), G. A. Wiese and Louisa Dohse, 10 May 1893, Clinton, Clinton, Iowa, United States; citing reference 13424, county courthouses, Iowa; FHL microfilm 1,005,212.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSQZ-NJG : accessed 12 April 2018), Gus Weise, Precinct 12 Chicago city Ward 24, Cook, Illinois, United States; citing enumeration district (ED) 721, sheet 3A, family 42, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,274.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJV3-7Z2 : 27 September 2017), Gustav Wiese in entry for Herbert C. Jepsen and Viola Hazel Wiese, 20 Jun 1918, Lyons, Clinton, Iowa, United States; citing reference item 2, county courthouses, Iowa; FHL microfilm 1,845,830.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8BX-68C : accessed 12 April 2018), Gus A Wiese, Deep Creek, Clinton, Iowa, United States; citing ED 23, sheet 5B, line 90, family 106, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 485; FHL microfilm 1,820,485.
"Iowa, County Death Records, 1880-1992," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVJP-JMBM : 17 March 2018), Gust Wiese in entry for Elizabeth Wiese, 09 Aug 1929; citing Death, Iowa City, Johnson, Iowa, United States, page 86, offices of county clerk from various counties; FHL microfilm 1,738,604.