Joshua Aaron Fishman , ( Yiddish : שיקל פֿישמאַן -- Shikl Fishman ; July 18 , 1926 -- March 1 , 2015 ) was an American linguist who specialized in the sociology of language , language planning , bilingual education , and language and ethnicity .
Joshua Aaron Fishman , ( Yiddish : שיקל פֿישמאַן -- Shikl Fishman ; July 18 , 1926 -- March 1 , 2015 ) was an American linguist . He specialized in the sociology of language , language planning , bilingual education , and language and ethnicity .