Mark Lesseraux . Mark is a New York City musician who has been active in the humanist movement and in organizing the World March in the City. He was the composer of the World march theme song and organized a concert in Brooklyn on October 2nd, Day of Nonviolence and first day of the March. Mark shared his testimonio during a rehearsal session the day before performing at a World March concert at Riverside Church. Weeks later, he attended the closing events in Argentina:Item Link