Samuel Karelitz [E21](1872-1965) cataloged the family in his family album.
He essentially traced the descendents
of his great-grandfather, dedicating
a page to each of his cousins and their families (more for
bigger families). This work was done in the years before World War II,
some updates even in the 1940's. A reasonably impressive work
for its time, but more than half a century later,
it's a family treasure.
His work is the primary source for the
content of this website
Dr. Neil Rosenstein is a physician from New Jersey, and on the side
is one of the world's foremost experts on Jewish / Rabbinical
genealogy. He is the author of The Unbroken Chain, which traces
the great Katzenellenbogen family.
While not a member of the Karelitz family, he researched it in
1980's as part of a larger work he is producing on the Epstein family,
within which the Karelitz family falls. His contributions form
bridge between the generations of the original family album and
those of today. He contributed to the content of this website.
Seth Kosowsky [G4512] is a physicist by training, and lives
with his family in Sharon, MA. He is a great-grandson of
Samuel Karelitz (E21 above). He was bitten by the genealogy bug
around 1993 (largely influenced by the above people)
and has yet to find a cure. He collects relatives (as his family puts it)
in his spare time.