University of Bristol - Historical Photographs of China reference number: Th-n04. John Cornelius Griggs is the maternal grandfather of John Griggs Thompson, the mathematician. The man behind Sun Yat-sen (and in the middle of this photograph) is SYS's body guard, Moishe (Morris) 'Two-gun' Cohen (1887-1970). See https://en.wikipedia.org/wiki/Morris_Cohen_(adventurer). See also Fu-n157, Th-n05, Th-n06.
Sun Yat-sen walking with John Cornelius Griggs and Morris Cohen
Black and white photograph