Who is Roland Barthes from Signs of Life in the U.S.A. and what is their importance?

Roland Barthes, 1914-1980, applied semiotics to almost every aspect of French culture and wrote a book called Mythologies that was published n 1957. He used the methodology to analyze cultural significance. He was the first to find political insinuations in many different aspects of culture, basically forms of entertainment. Barthes gave the methodology of semiotics its political dimension.