My husbands cousin did extensive work on John Pancratius Klein that came over from Mainz-Hechtsheim, Hesse-Darmstadt, Germany in 1857 at age 23 and was Naturalized in 1863. I have a book, have not yet entered anyone into Wikitree or checked to see if they are already here, but my daughter did her DNA at Ancestry and it hooked right up with the researchers mother