John Hagerman was born in Upper Mt. Bethel Township, Northampton County, Pennsylvania on June 11, 1808. His father was Francis Hagerman, born in New Jersey of early New Amsterdam Dutch heritage and his mother, Anna DeCou, was of early New Jersey Huguenot heritage. John came to Independence Township, Oakland County, Michigan in 1831 with his father and older brother William, and purchased land. William stayed on in that township and raised his family, but John returned to Mt. Bethel Township where he married a girl from across the Delaware River by the name of Adeline Angle, daughter of David and Rachel (Gardner) Angle of Knowlton Township, Warren County, New Jersey.
Their eldest daughter Rachel gardener Hagerman was born in Upper Mt. Bethel and married William Smith of New Jersey before moving to Bloomfiled Township, Oakland County, Michigan.
Their second daughter Anna and sons William A. , Francis H. and David A. all moved with their parents to Bloomfield Township in the Spring of 1862 after their grandparents Anna and Francis died.
William Angle Hagerman married (1) Elizabeth Patchett of Birmingham, Oakland County, Michigan in 1870 and (2) Mrs. hannah J. Wilson of St. Petersburg, Florida.
Francis H. Hagerman married Rosetta Adelaide Daines, daughter of John & Alice Ann (Watkins) Daines of Birmingham, Oakland County, Michigan on July 18, 1870.
David Angle Hagerman married "Gussie" and moved his family of four children to Maxey, Texas.
Before John became blind during the last 20 years of his life, he was a farmer and hotel keeper in Bloomfiled Center which is now Bloomfield Hills. He was a charter member of the Oakland County Pioneer and Historical Society. He died on May 17, 1889. Adeline followed on June 11, 1907 and both are buried in Greenwood Cemetery, Birmingham, Michigan.