Monroe S. Heintzelman was born February 7, 1857. At the age of twenty-one years he learned the carpenter trade and followed it four years. In 1882, he moved to Kressleytown, in Heidelberg upon the farm of his father-in-law, John Snyder, and after farming there five years he moved to another farm which was also owned by his father-in-law, situated along the Schochary in Lynn. Two years later, in 1889, he moved upon his own farm of 66 acres, near Lynnport. This farm was the Lorentz homestead. In 1845 his nephew, John A. Reitz, purchased it, and he built the present brick-house in 1871. The bricks were manufactured upon the premises.

Mr. Heintzelman built the barn in 1893. The farm is named the "Ontelaunee Farm." He and his family are Lutheran members of the New Tripoli church, which he served as a deacon. In 1881 he married Caroline Snyder.