Henri Bergson (1859-1941) was one of the most famous and influential French philosophers of the late 19th century-early 20th century. Although his international fame reached cult-like heights during his lifetime, his influence decreased notably after the second World War. While such French thinkers as Merleau-Ponty, Sartre, and Lévinas explicitly acknowledged his influence on their thought, it is generally agreed that it was Gilles Deleuze’s 1966 Bergsonism that marked the reawakening of a wide and growing interest in Bergson’s work. Deleuze realized that Bergson’s most enduring contribution to philosophical thinking is his concept of multiplicity. Therefore, due to Deleuze’s realization, a kind of revitalization of Bergsonism has been going on since around 1990.