An update to the Poskanzer Family Tree has been posted at: http://art.poskanzer.org/PoskanzerTree/ .
There are new clear photos of tombstones in Albany cemeteries nicely taken by Susan Poskanzer, with careful translations of the Hebrew by Olga Zabludoff: http://art.poskanzer.org/photos/cemeteriesAlbany/index.html .
Jane Frueh has kindly added extensively to the Rosenberg line, with many dates, etc.
Progress has been made on the Ukraine branch of the family which probably started with Abraham Pushkantser, born 1872 in Rumshishok, Lith. region of Russia, and who migrated about 1900 to the Ukraine. Max Pushkantser of St. Petersburg has been a great help. His old photos are at http://art.poskanzer.org/photos/Max/index.html . He also obtained a police report from 1924 from the State Archive of Republic of Moldova about a Pushkantser who Illegally crossed the border from USSR to Bessarabia. It was translated from Romanian to Russian and then by Max to English. I found two Pushkantsers from the Ukraine who were killed in the Red Army in World War II, two more who died in the Holocaust, and four who are listed as survivors, one of whom now lives in Queens, NY. Marc Diemont (Poskanzer) was born in Kiev in 1898 before coming to the US at the age of 6. Even my grandfather David Chaim Poskanzer went to "deep Russia" before emigrating to the US. As far as I know no Pushkantsers remain in the Ukraine today. The most famous living person from the Ukraine branch of the family (based on the number of hits at google.com.ua) is Natalia Andreeva Pushkantser, a concert pianist now in Stavropol, Russia.
A bridge engineer, Eli Pushkantser, and his daughter, Miriam, lived in Germany and died in the Holocaust. Sonny Poskanzer had heard of them, but we have not been able to fit them into the tree.
The origin of the surname Pushkantser was probably the village Puszkance. I found it in two early 19th century references, but have not found the modern counterpart. For details see http://art.poskanzer.org/PoskanzerTree/Pushkantser.html .
Olga Zabludoff and I thank all of you who have helped and hope you continue to send additions and corrections, as well as old photos.