"The man who saved a million brains", though the numbers in the article suggest that's being undercounted by a factor of 100.
Dr. Creswell Eastman convinced the Chinese government to mandate iodized salt and changed hundreds of millions of lives for the better.
https://www.abc.net.au/news/2025-05-25/professor-creswell-eastman-dies-age-85/105318606