Gilles Deleuze is the name of the professor of philosophy who wrote this text among several other books. It is his thought, compiled ideas and impressions of other philosophers and film artists that he expresses throughout the text. Deleuze selects Bergson as his counterparty against which to weigh and balance his own theories. There are three principles or theses of Bergson against which the author raises critiques. Deleuze is the main and most important character in the text, even though he does not mention himself as an important character because the text is comprised of his thoughts and critical analyses.