http://www.ams.org/publications/journals/notices/201706/rnotip551.pdf

#1 mgraczyk:
Unrelated to the content of the article, but I took two courses with the author. He had a style of teaching that often broadly related the material to seemingly unrelated topics in ways that made lectures fun and easy to remember. I think that style comes across in his writing here.

#2 mathgenius:
From a mathoverflow thread "Open problems in mathematical physics":
https://mathoverflow.net/questions/275011/openproblemsinm...