born Alsace, France, died Harrison Twp, this is a private cemetery.
He married first to Madeline Hoffman 7 Apr 1836. She died in childbirth with twins. His second wife, Maria, gave birth to ten children: Jacob, Catherine, George, Adam, Christian, Samuel, Maria Louise, Frederick, John, and Mary Magdalena Leininger.
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The Boone County Democrat

[It states first wife is Eckard which is in error.]

On Saturday morning Michael Leininger, one of the oldest and most respected citizens of Boone County, passed to his reward. He was one of our earliest farmers and was forced to endure many of the privations of pioneer life. A native of Germany, he was born in Alsace, November 22, 1915, and was therefore eighty two years at the time of his disease. His first wife was Magdalene Eckman, who lived but a short time after their marriage. In 1838 he was married the second time, to Maria Madalene, his widow surviving him. He immigrated to Ohio in 1839 and resided in that state until 1856, when he came to Iowa and settled in this county, Harrison Township being his home. Nine children were born to Mr. and Mrs. Leininger and his grandchildren and great grandchildren number nearly a hundred. He was a devout member of the Lutheran church and one of the founders of it in Boone County. The funeral was held Monday from the church in Harrison Township and was one of the largest in the county's history.
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AH89 writes:

Michael Leininger was born 22 November 1815 at 9AM in house #46 in Menchhoffen, France to Jacob and Margaret (née Schultz) Leininger.

Michael married Magdalena Hoffmann on 7 April 1836 in Menchhoffen. Magdalena Hoffmann was born 9 July 1805 (yes, 9 years older than Michael) in the neighboring village of Obermodern, which later merged with a neighboring town and is known today as Obermodern-Zutzendorf. She was the daughter of Jacob Hoffmann (weaver; died 15 January 1811 in Obermodern) and Elisabetha Eckmann (age 68, so born circa 1768). Magdalena died at 2AM on 14 July 1838 in Obermodern. The death record did not have a field for cause of death and nothing was written indicating the cause of death. There were no birth records in Obermodern that day and so, if the obituary is correct, neither twin survived.

Michael married Anna Magdalena Krieger on 19 September 1838 in Obermodern. The record says his parents were both living abroad, which presumably means they had already emigrated to the US. Anna Magdalena Krieger was born 21 November 1814 in Uttwiller to George Krieger (day laborer; age 64, so born circa 1774) and Margaretha M__k (Muck? Meuk?; died 6 April 1822 in Uttwiller). Uttwiller is adjacent to both Menchhoffen and Obermodern.

At the time of his marriages and death of his first wife, Michael was a weaver.

A couple of notes:

In France, the family, like nearly all in the Alsace region, spoke German as their mother tongue, but records were kept in French. Magdalena is used above as the German equivalent, using the most common spelling, of the French name Madeleine, which was the name used in the marriage and death record. Likewise, Michael was Michel, Jacob was Jacques, Elisabetha was Elisabeth, and Margaretha was Marguerithe. Of course, that practice is not unlike the way that English names were used in documents in the US, even though many immigrants did not understand English for many years after their arrival (eg. John used for the German Johann in a census).

Second, France instituted civil marriages in the 1790s. All legally-recognized marriages were in the town hall and performed by the mayor. The couple would go to the town hall, be instructed by the mayor about the duties of marriage, then sign the marriage record (father of bride usually gave consent for the bride). This would be done before at least 3 witnesses (who were not immediate family or the mayor) and typically a small number of friends/family. This type of marriage is still the norm in Europe today. That is the record used for the above marriage dates. They almost certainly had a marriage in the town's church, which may not have necessarily occurred on the same day.

Finally, at the time of his first wife's birth, France was using the French Republican Calendar. In the marriage record, the FRC birthdate 20 Messidor Year 13 was used, which corresponds to 9 July 1805.

Info about birth and marriages provided by Find A Grave user AH89, using information contained in birth, marriage, and death records on the website of the Bas-Rhin Archives.