In the United States, Lindlof and Taylor write, "Cultural studies [were] grounded in a pragmatic, liberal-pluralist tradition". The American version of cultural studies initially concerned itself more with understanding the subjective and appropriative side of audience reactions to, and uses of, mass culture; for example, American cultural-studies advocates wrote about the liberatory aspects of fandom.[citation needed] The distinction between American and British strands, however, has faded.[citation needed] Some researchers, especially in early British cultural studies, apply a Marxist model to the field. This strain of thinking has some influence from the Frankfurt School, but especially from the structuralist Marxism of Louis Althusser and others. The main focus of an orthodox Marxist approach concentrates on the production of meaning. This model assumes a mass production of culture and identifies power as residing with those producing cultural artifacts. In a Marxist view, those who control the means of production (the economic base) essentially control a culture.[citation needed] Other approaches to cultural studies, such as feminist cultural studies and later American developments of the field, distance themselves from this view. They criticize the Marxist assumption of a single, dominant meaning, shared by all, for any cultural product. The non-Marxist approaches suggest that different ways of consuming cultural artifacts affect the meaning of the product. This view comes through in the book Doing Cultural Studies: The Story of the Sony Walkman (by Paul du Gay et al.), which seeks to challenge the notion that those who produce commodities control the meanings that people attribute to them. Feminist cultural analyst, theorist and art historian Griselda Pollock contributed to cultural studies from viewpoints of art history and psychoanalysis. The writer Julia Kristeva is among influential voices at the turn of the century, contributing to cultural studies from the field of art and psychoanalytical French feminism.[citation needed]

Which two wrote Cultural studies [were] grounded in a pragmatic, liberal-pluralist tradition?