Who’s the photographer?
Normally my answer would be ’no clue’, but by coincidence I do have a source for this one. Hiromu Kira
The Thinker (The J. Paul Getty Museum Collection)

The Thinker (The J. Paul Getty Museum Collection); about 1930; Hiromu Kira (American, 1898 - 1991); Gelatin silver print; Image: 27.9 × 35.1 cm (11 × 13 13/16 in.); 85.XP.29.71

The J. Paul Getty Museum Collection
Great, thanks. Weirdly, he now goes on my list of favourite Japanese damn and hydrological infrastructure photographers, along with Toshio Shibata