Ngo Bao Chau (with appropriate accent marks) has a blog. It is in Vietnamese, because he is Vietnamese. http://thichhoctoan.net/ I don't know how much he writes about math because I don't read Vietnamese. I know he writes a lot about politics, or at least used to.
Cedric Villani writes about math for Le Monde sometimes and has a blog on his website. http://cedricvillani.org/ I am not good at French, so I don't read it.
I think 10% for living Fields medalists who blog is pretty high, and many of those living are older. (And two have basically withdrawn from mathematical society.)
You missed two blogging Fields medalists.
Ngo Bao Chau (with appropriate accent marks) has a blog. It is in Vietnamese, because he is Vietnamese. http://thichhoctoan.net/ I don't know how much he writes about math because I don't read Vietnamese. I know he writes a lot about politics, or at least used to.
Cedric Villani writes about math for Le Monde sometimes and has a blog on his website. http://cedricvillani.org/ I am not good at French, so I don't read it.
I think 10% for living Fields medalists who blog is pretty high, and many of those living are older. (And two have basically withdrawn from mathematical society.)