I can recommend Asimov to anyone without hesitation. In fact I'll have to watch myself in case I lavish praise on him too freely. His sci-fi was never my favourite style, but he was a truly masterful writer - and profuse! I've read nearly all of his fiction, and a decent proportion of his essays as well. As far as the fiction goes - he isn't the most, ah, exciting of authors, but his stories are immensely enjoyable nonetheless, because his technique was (at least once he'd written a few novels) very nearly text-book perfect. As far as his essays go; I've never seen any other author give credibility to the style of 'popular science' apart from him. The ability to take complex ideas and communicate them in simple language, while avoiding over-simplification and without ever 'talking down' to the reader, is fabulously rare. For any writers out there, you really couldn't do better than to use him as a real-world example of the KISS principle. ("keep it simple, stupid") Don't stop at the Foundation series! The quality of his work is extremely consistent. If you enjoy any of it, you'll probably enjoy most of it. Now I'll stop gushing Last note: if you can, find the collections of stories which he edited and prefaced later in life - I found it fascinating to hear him discuss his own work.
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"Beauty existed before 1880, but it was Oscar Wilde who managed her début."