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'''Peter L. Berger''' (March 17, 1929) is an Austrian-born American sociologist best known for his work in the fields of the sociology of knowledge/religion, the study of modernization, and various theoretical contributions to sociology.   

'''Peter L. Berger''' (March 17, 1929 to June 29, 2017) is an Austrian-born American sociologist best known for his work in the fields of the sociology of knowledge/religion, the study of modernization, and various theoretical contributions to sociology.   

Berger's work ''Treatise in the Sociology of Knowledge'' (New York, 1966) was declared by the International Sociological Association as being the fifth most influential book written in the field of sociology during the 20th century.<ref>[http://www.isa-sociology.org/books/books10.htm International Sociological Association - Books of the Century]</ref>  

Berger's work ''Treatise in the Sociology of Knowledge'' (New York, 1966) was declared by the International Sociological Association as being the fifth most influential book written in the field of sociology during the 20th century.<ref>[http://www.isa-sociology.org/books/books10.htm International Sociological Association - Books of the Century]</ref>