The Jewish Encyclopedia is an English encyclopedia containing over 15,000 articles on the history, culture, and state of Judaism and the Jews up to the early 20th century. It was originally published in 12 volumes by Funk and Wagnalls of New York City between 1901 and 1906 and reprinted in the 1960s by KTAV Publishing House. The work's scholarship is still highly regarded: the American Jewish Archives has called it "the most monumental Jewish scientific work of modern times" and Rabbi Joshua L. Segal noted that, "For events prior to 1900, it is considered to offer a level of scholarship superior to either of the more recent Jewish Encyclopedias written in English." It is now in the public domain and hosted at various sites around the internet. 

The encyclopedia's managing editor was Isidore Singer. The editorial board was chaired by Isaac K. Funk and Frank H. Vizetelly. The other editors participating in all twelve volumes were Cyrus Adler, Gotthard Deutsch, Richard Gottheil, Joseph Jacobs, Kaufmann Kohler, Herman Rosenthal, and Crawford Howell Toy. Morris Jastrow, Jr. and Frederick de Sola Mendes assisted with volumes I & II; Marcus Jastrow with volumes I, II, & III; Louis Ginzberg with the first four volumes; Solomon Schechter with volumes IV through VII; Emil G. Hirsch with volumes IV through XII; and Wilhelm Bacher with volumes VIII through XII. William Popper served as the assistant revision editor and chief of translation for Vols. IV through XII.
What is the Jewish Encycolpedia?
When was it originally published?
By whom?
What sis the American Jewish Archives call it?
Who was the editorial board chared by?
anyone else?
What did Rabbi Joshua L Segal note about it?
Who was the assistant revision editor and chief of translation  for volumes IV through XII?
Who assisted in editing Volumes I &II?
Is the Encyclopedia now in the public domain?
Who was the managing editor?
When was it republished?
Who republished it?
is it available on the internet?
what Volumes did Emil G Hirsch assist with editing?
an English encyclopedia
The Jewish Encyclopedia is an English encyclopedia
between 1901 and 1906
It was originally published in 12 volumes by Funk and Wagnalls of New York City between 1901 and 1906 
Funk and Wagnalls
It was originally published in 12 volumes by Funk and Wagnalls
"the most monumental Jewish scientific work of modern times"
: the American Jewish Archives has called it "the most monumental Jewish scientific work of modern times"
Isaac K. Funk
The editorial board was chaired by Isaac K. Funk and Frank H. Vizetelly.
yes
 and Frank H. Vizetelly
that, "For events prior to 1900, it is considered to offer a level of scholarship superior to either of the more recent Jewish Encyclopedias written in English."
 Rabbi Joshua L. Segal noted that, "For events prior to 1900, it is considered to offer a level of scholarship superior to either of the more recent Jewish Encyclopedias written in English." 
William Popper
William Popper served as the assistant revision editor and chief of translation for Vols. IV through XII
Frederick de Sola Mendes
Frederick de Sola Mendes assisted with volumes I & II; 
yes
It is now in the public domain and hosted at various sites around the internet. 
Isidore Singer
encyclopedia's managing editor was Isidore Singe
in the 1960s
reprinted in the 1960s 
KTAV Publishing House.
 reprinted in the 1960s by KTAV Publishing House.
yes
It is now in the public domain and hosted at various sites around the internet. 
volumes IV through XII
Emil G. Hirsch with volumes IV through XII