Rudolf Oskar Robert Williams Geiger (/ˈɡaɪɡər/; German: [ˈɡaɪɡɐ]; 24 August 1894 – 22 January 1981) was a German meteorologist and climatologist.
He was the son of Indologist Wilhelm Geiger and the brother of physicist Hans Geiger.
He worked with Wladimir Köppen on climatology, hence the Köppen–Geiger climate classification.
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