 Paul Ricoeur and Judith Butler wrote monographs drawing new attention to Kierkegaard's work, and a 1964 UNESCO colloquium on Kierkegaard in Paris ranks as one of the most important events for a generation's reception of Kierkegaard, which included a keynote speaker, Sartre who gave his lecture "The Singular Universal", which solidified Kierkegaard's influence over existentialism.In America, interest in Kierkegaard was revived from the 1980s onwards, particularly by the American philosopher and curator of the Kierkegaard Library at St. Olaf College Gordon Marino, who has devoted several books and essays to Kierkegaard.In Kierkegaard's native Denmark, the Danish people hosted his 200th anniversary of Kierkegaard's birth in Copenhagen in May 2013.