William John Richardson, S.J. (2 November 1920 – 10 December 2016) was an American philosopher, who was among the first to write a comprehensive study of the philosophy of Martin Heidegger, featuring an important preface by Heidegger himself.^[1] In addition to his specialization in Heidegger, Richardson was also, as a trained psychoanalyst, a specialist in the thought of Jacques Lacan. He was a Jesuit priest (entering the order on 14 August 1941, he was ordained a priest on 15 August 1953). He taught philosophy at St.Peter's College, Fordham University, and, beginning in 1981, at Boston College, where he was, at the time of his death, emeritus professor of philosophy. He died in December 2016 in Weston, Massachusetts at the age of 96.^[2]