Caption: "The Indian mathematician Srinivasa Ramanujan (1887--1920) together with his colleague G. H. Hardy 1877--1947) (extreme right) and other scientists at Trinity College, University of Cambridge." (Slightly edited.) Bertrand Russell (1872--1970) does NOT seem to be present, unless he's at the back looking away from the camera. Google AI: origin of photo of ramanujan at cambridge says only Srinivasa Ramanujan (1887--1920) and G. H. Hardy 1877--1947) are identified.

Ramanujan is considered one of the greatest intuitive mathematicians.

By the by this is probably NOT graduation photo: Cantabrigians just dress like this all the time.

Credit/Permission: Charles F. Wilson, 1914--1919 (uploaded to Wikimedia Commons by User:Florean_Fortescue, 2011) / Public domain.
Image link: Wikimedia Commons: File:RamanujanCambridge.jpg.
Local file: local link: ramanujan_1919.html.
File: Mathematics file: ramanujan_1919.html.