Leon Rehmann was born Friday, November 22, 1895 in Millville City, Cumberland County, New Jersey. He was the third of the six children of George Charles Conrad and Ida Emmaline (White) Rehmann.

In a 1917 account, he was listed as a farmer but in 1920 he was shown as being a laborer in a shipyard. He lived on Downer Franklinville Road in Monroe Township, Gloucester County according to the 1940 census and was self-employed as a carpenter and brick layer. By 1947, he was living on Glassboro Road in Williamstown, Gloucester County, New Jersey.

He died on February 6, 1947 at the age of 51 in Williamstown and is buried in the Methodist Cemetery in that town.