Bert was born about 1875 to Henry Heisler and Lizzie Maynard.
Sources
Marriage
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJCP-TH9 : 10 February 2018), Bert Heisler and Myrtie Kelly, 21 Oct 1896, Sac City, Sac, Iowa, United States; citing reference p140 cn1624, county courthouses, Iowa; FHL microfilm 1,433,254.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJ8P-X8V : 10 February 2018), Bert Heisler and Myrtle Kelly, 21 Oct 1896, Sac City, Sac, Iowa, United States; citing reference Item 2, county courthouses, Iowa; FHL microfilm 1,433,255.
Death
Find a Grave, database and images (https://www.findagrave.com/memorial/40378099 : accessed 18 July 2020), memorial page for Bert L. Heisler (16 Nov 1875–8 Apr 1938), Find a Grave Memorial no. 40378099, citing Heisler Cemetery, Mapleton, Monona County, Iowa, USA ; Maintained by Conley Wolterman (contributor 46883894) .
Census
"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQ3-N14 : 4 April 2020), Bert L Heisler in household of Elizabeth Heisler, Monona, Iowa, United States; citing p. 429, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,085.
"Iowa State Census, 1925," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QKQQ-MTY9 : 20 June 2020), Bert L Heisler, Monona, Iowa, United States; citing Monona, Iowa, United States, Iowa State Historical Department, Des Moines; FHL microfilm .
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMV4-7KD : accessed 18 July 2020), Bert Heisler in household of Elizabeth Holliday, Mapleton, Monona, Iowa, United States; citing enumeration district (ED) ED 20, sheet 4B, line 99, family 110, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 669; FHL microfilm 2,340,404.
Military
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ2N-CSM : 25 August 2019), Bert Leroy Heisler, 1917-1918.
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DNA Connections
It may be possible to confirm family relationships with Bert by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: