He and his wife (who was also a geologist) were fluent in Chinese and would speak in it if they wanted privacy.
He became known for international humanitarian missions during and after the first world war. He became a national figure by directing flood relief operations during the 1927 Mississippi Flood, which catapulted him into the White House a year later.
He was a much better humanitarian than he was a president. And pretty good geologist and linguist too.