Hermann Schmidt<sup>(<a href="https://de.wikipedia.org/wiki/Hermann_Schmidt_(Mathematiker)" class="extiw" title="de:Hermann Schmidt (Mathematiker)">de</a>)</sup> from Jena, attending the visitors' conference 26th - 28th October 1930 of the Mathematical Society Jena. Between 1927 and 1935 he was assistent of Robert König<sup>(<a href="https://de.wikipedia.org/wiki/Robert_K%C3%B6nig" class="extiw" title="de:Robert König">de</a>)</sup> who stands in front of him on the source picture (Nr.57). Compare also Schmidt's photo at <a rel="nofollow" class="external text" href="http://www.history.didaktik.mathematik.uni-wuerzburg.de/mathematik/neuanfang.html">uni-wuerzburg.de</a>.
Jochen Burghardt
CC BY 3.0
Cropped from <a href="//commons.wikimedia.org/wiki/File:Mathematische_Gesellschaft_Jena_1930.jpg" title="File:Mathematische Gesellschaft Jena 1930.jpg">File:Mathematische Gesellschaft Jena 1930.jpg</a> (Nr.58)