 He continued his work as a bibliographer and proofreader (1954–1956), and then, from the 1970s until 1986, he was a bibliographer, proofreader and finally editor of YIVO's "Yiddishe Shprakh," a journal devoted to the pronunciation, grammar and vocabulary of Standard Yiddish.He also founded the Committee for the Implementation of the Standardized Yiddish Orthography in 1958.From 1981 until his retirement in 1993, he was Senior Lecturer in Yiddish Studies at Columbia University in New York.