Bloch first studied linguistics at Northwestern University. In the early 1930s, he was recommended by his teacher, Werner F. Leopold, as a fieldworker for the Linguistic Atlas project led by Hans Kurath. While undertaking fieldwork on New England dialects, he also taught part-time at Mount Holyoke College. There he met his future wife, Julia McDonnell Bloch. Bloch enrolled for doctoral studies at Brown University, where he studied under Hans Kurath. In 1935 he received his PhD for a thesis entitled, "The treatment of Middle English final and preconsonantal R in the present-day speech of New England". From 1937–1943 he served as instructor and then assistant professor at Brown. During this period Bernard and Julia Bloch were on the editorial staff of the Linguistic Atlas of New England. They also contributed to the Handbook of the Linguistic Geography of New England. In 1943 Bloch took up a position at Yale, where he eventually became professor of linguistics. Bloch is considered one of the leading linguists of the post-Bloomfieldian school, active in the 1940s and 1950s, who concentrated on the description of synchronic language systems and on the development of a methodology for collecting and analyzing language data. Bloch's work contributed to three main areas of linguistic research: phonology, syntax and the analysis of Japanese. His analysis of spoken Japanese had a lasting influence on Japanese language textbooks in the US.
Bloch was president of the Linguistic Society of America in 1953. He was Editor of the society's publication, Language, from 1940 until his death. The Bernard and Julia Bloch Fellowship, awarded by the Linguistic Society of America to 'the most promising applicant' to the LSA Summer Institute, was established from the Julia Bloch Memorial Fund. The Bernard and Julia Bloch fellowship was first awarded in the summer of 1970.
Selected publications
Linguistic Atlas of the United States and Canada: Section I. Linguistic Atlas of New England, Vol.1, Maps, Brown University, Providence, 1939
"Postvocalic r in New England speech, a study in American dialect geography." In Readings in American Dialectology, eds. Harold Byron Allen and Gary N. Underwood. New York: Appleton-Century-Crofts., 1939
Handbook of the Linguistic Geography of New England, Brown University, Providence, 1939
Linguistic Atlas of New England, Vol.2, Maps, Brown University, Providence, 1943