 After settling in the United States he worked as a lecturer in Russian and Ukrainian at Harvard University (1952-4), associate professor (1954-8) and professor of Slavic philology at Columbia University (1958–77).He was one of the founders and president of the émigré scholarly organization “Ukrainian Free Academy of Sciences” (1959–61, 1981–86) and received an honorary doctorate from the University of Alberta (1983) and Lund University (1984).He was a founding member of the Slovo Association of Ukrainian Writers in Exile and was published in numerous émigré bulletins and magazines.