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Two of the major achievements of Stephen Hawking are described in elementaryterms. They are his work on the beginning of the universe and his work on theend of black holes. These are perhaps the scientific achievements for which heis best known. Some of the qualities that enabled his great achievements arealso described. The article is a slightly edited version of one solicited bythe Proceedings of the (US) National Academy of Sciences for theirRetrospectives section and will appear there.

Stephen Hawking (1942-2018), Towards a Complete Understanding of the Universe