Dag Hjalmar Agne Carl Hammarskjöld ( , ; 29 July 1905 – 18 September 1961) was a Swedish economist and diplomat who served as the second Secretary-General of the United Nations from April 1953 until his death in a plane crash in September 1961. As of 2023, he remains the youngest person to have held the post, having been only 47 years old when he was appointed. He was a son of Hjalmar Hammarskjöld, who served as Prime Minister of Sweden from 1914 to 1917. Wikipedia
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