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In page James Hilton (novelist):

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Hilton is said to have been inspired to write Lost Horizon, and to invent "Shangri-La", by reading the National Geographic articles of Joseph Rock, an Austrian-American botanist and ethnologist exploring the southwestern Chinese provinces and Tibetan borderlands. Still living in Britain at the time, Hilton was perhaps influenced by the Tibetan travel articles of early travelers in Tibet whose writings were found in the British Library.[2] Christian Zeeman, the Danish father of the mathematician Christopher Zeeman, has also been claimed to be the model for the hero of the story. He disappeared while living in Japan (where his son was born in 1925), and was reputed to be living incognito in a Zen Buddhist monastery.[citation needed]