Born in Lithuania (then part of the Russian Empire), he emigrated to the United States, where he founded a manufacturing company and became a millionaire.
[4] Upon his arrival, Rabinowitz worked menial jobs and learned English by reading books in the Cooper Union library.
[12] This led to the exploration of ancient synagogues in Caesarea, Yafa an-Naseriyye, Sha'alvim and other places in Israel.
[18] He also owned paintings by Benjamin West, like his 1768 Agrippina Landing at Brundisium with the Ashes of Germanicus, later donated to the Yale University Art Gallery.
[3][4] By December 1957, the Yale University Library established the Louis M. Rabinowitz Memorial Fund in his honor.
[17] A 1967 file from the Federal Bureau of Investigation showed that it supported Civil Rights leader Floyd McKissick.