The video is by the mathematician Michel Talagrand.
https://en.wikipedia.org/wiki/Michel_Talagrand
A surprising tip from his personal page.
"If you are desperate to get my books and your library can't afford them, try to type the words "library genesis" in a search engine. I disagree with piracy, but this site saved me many trips to the library, which unfortunately does not carry electronic versions of older books."