Robert Langlands on Harish-Chandra [2014]

From a channel Lumen includes in full: The channel is an archive of graduate and research-level mathematics and physics lectures (Scholze, Sarnak, Coleman's QFT course, ICM talks, summer school sessions, analytic combinatorics course segments), along with a few serious historical and science documentaries. Every transcript sampled shows substantive teaching or expert exposition, with no hype, clickbait or entertainment framing. The only borderline items are informal 'conversation' interviews, which are excluded by title pattern as a precaution.

A 17-minute video from Graduate Mathematics's catalogue; the title names its topic.

Video by Graduate Mathematics, played through YouTube's embedded player.