Mark Vonnegut — American Author born on May 11, 1947,
Mark Vonnegut is an American pediatrician and memoirist. He is the son of writer Kurt Vonnegut, Jr. and his first wife, Jane Cox. He is the brother of Edith Vonnegut and Nanette Vonnegut. He described himself in the preface to his 1975 book as "a hippie, son of a counterculture hero, BA in religion, genetic disposition to schizophrenia.":preface.. (wikipedia)