<a href="https://en.wikipedia.org/wiki/Nikolai_Tchaikovsky" class="extiw" title="w:Nikolai Tchaikovsky">Nikolai Tchaikovsky</a>, date of photo not recorded.
Bain News Service photo via Library of Congress website
<a rel="nofollow" class="external text" href="http://hdl.loc.gov/loc.pnp/ggbain.04698">http://hdl.loc.gov/loc.pnp/ggbain.04698</a>