[1] He wrote hundreds of songs for the theatre which were performed by such actors as Boris Thomashefsky, David Kessler, and Jacob Adler, as well as by Lillian himself.
In 1911 he took over management of the Union Theatre where he planned to stage his own productions with his wife Annie Black and his collaborator Alex Cohn.
[10] His lyrical contributions to Isidore Solotarefsky's Yesoymim fun der velt (Orphans of the World) in 1916 were regarded as some of the best work of his career, even decades later.
[11] The two men sometimes staged 1-act plays or scenes in the home and were planning to do more when Lillian died unexpectedly on August 27, 1960, at age 78.
[15][6] Isidore married his wife Annie (née Black), born in Minsk, Russian Empire, in December 1906.