Peter Woit (https://www.math.columbia.edu/~woit/wordpress/) has occasionally posted about Grothendieck's life and work. E.g.

Articles on his life: https://www.math.columbia.edu/~woit/wordpress/?p=7335

Two Titans (Grothendieck and Witten) - https://www.math.columbia.edu/~woit/wordpress/?p=12868

AMS Math articles on Grothendieck - https://www.math.columbia.edu/~woit/wordpress/?p=78