An accessible guide to the principles and vision of Dag Hammarskjld a man John F. Kennedy called the greatest statesman of our century. Dag Hammarskjld served as SecretaryGeneral of the United Nations from 1953 until his tragic Dag Hammarskjld served as secretarygeneral of the United Nations from 1953 until his tragic death in a suspicious plane crash in 1961. During those years he saw the fledgling international organization through numerous crises with skill that made him a star on the inter