In Memoriam - Alexandre Grothendieck

This linked article is written to honor his memory. May he rest in peace.
He was truly, the greatest mathematician of the 20th century.

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A talk at Institut de Hautes Etudes Scientifiques providing an overview of the mathematics of Grothendieck

One of the rare instances of recorded voice of Grothendieck speaking on the meaning and value of scientific research in the context of rejecting research for the development of nuclear weapons:

Recent testimony from a variety of Grothendieck contemporaries (Courtesy Tony Iarrobino)/

Articles in AMS Notices :

1.   http://www.ams.org/journals/notices/201603/rnoti-p242.pdf 

2. http://www.ams.org/publications/journals/notices/201604/rnoti-p401.pdf

Article in Nature
3.https://www.nature.com/nature/journal/v517/n7534/full/517272a.html