Ray Haupt has not only published his work, but he has an amazing website for the study of this name and histories related to it.
The HENSEL line in my family is related to general Herman Haupt through marriage with Anna Cecelia Keller (Her sister Louisa Caroline would marry his brother Lewis and we are related through another sister Mary Keller who married Shipping magnate and friend of the Haupts; Charles Norton) The Keller family was a large influence in the Lutheren Church in Pennsylvania. Mary's father Reverend Benjamin Keller and his son Muhlenburg Keller (named after Reverend Muhlenburg) were some of the foundations to these churches throughout Philadelphia, Lancaster, Harrisburg, Gettysburg and other areas of PA.
Herman Haupt and his brother Lewis Haupt were both very skilled engineers and are the authors of several bridges and were instrumental for the railroad lines. Both were close to President Lincoln and worked with him to build the rail system on the east coast. Several of our Hensel ancestors (who would be nephews to Mary & Herman) took jobs with the Haupt family and my Great Great Grandfather and his brothers all went to various areas to work on the Northern Pacific Railroad thanks to the Haupt men.
I recently obtained copies of letters between Keller/Haupt/Hensel families and have yet to read them.
If you are a Haupt family researcher make sure you visit this website-its is rich with information, photographs and such a varied range of Haupt/Houpt families. Thanks to ray Haupt for his research into this line.
http://www.geocities.com/Heartland/Lake/3234/Haupt.htmlI have previously posted our line of the Haupts here. If interested please check the archives.