Linguista statunitense (Filadelfia 1926 - New York 2015); docente emerito di scienze sociali alla Yeshiva University di New York, ha dato importanti contributi agli studî di sociolinguistica. Tra le sue opere: Yiddish in America (1965), Language loyalty in the United States (1966), Read ings in the sociology of language (1968), Advances in the sociology of language (1971), Read ings in the sociology of Jewish languages (1985); Reversing language shift (1991); The multilingual apple: languages in New York City (con O. Garcia, 1997); Can threatened languages be saved? (2000); Introduction to test construction in the social and behavioral sciences. A practical guide (con T. Galguera, 2003); Do not leave your language alone (2006).