Gabriel Honoré Marcel (7 December 1889 – 8 October 1973) was a French philosopher, playwright, music critic and leading Christian existentialist. The author of over a dozen books and at least thirty plays, Marcel's work focused on the modern individual's struggle in a technologically dehumanizing society. Though often regarded as the first French existentialist, he dissociated himself from figures such as Jean-Paul Sartre, preferring the term philosophy of existence or neo-Socrateanism to define his own thought. The Mystery of Being is a well-known two-volume work authored by Marcel. Marcel was born on 7 December 1889 in Paris, France. His mother Laure Meyer, who was Jewish, died when he was young and he was brought up by his aunt and father, Henry Marcel. When he was eight he moved for a year where his father was minister plenipotentiary. Marcel completed his DES thesis (fr, roughly equivalent to an MA thesis) and obtained the agrégation in philosophy from the Sorbonne in 1910, at the unusually young age of 20. During the First World War he worked as head of the Information Service, organized by the Red Cross to convey news of injured soldiers to their families. He taught in secondary schools, was a drama critic for various literary journals, and worked as an editor for Plon, the major French Catholic publisher.Gabriel (-Honoré) Marcel, Stanford Encyclopedia of Philosophy' Marcel was the son of an agnostic, and was himself not a member of any organized religion until his conversion to Catholicism in 1929. Marcel was opposed to anti-Semitism and supported reaching out to non-Catholics. He died 8 October 1973 in Paris. He is often classified as one of the earliest existentialists, although he dreaded being placed in the same category as Jean-Paul Sartre; Marcel came to prefer the label neo-Socratic (possibly because of Søren Kierkegaard, the father of Christian existentialism, who was a neo-Socratic thinker himself).