<a href="https://en.wikipedia.org/wiki/Klaus_T%C3%B6pfer" class="extiw" title="w:Klaus Töpfer">Klaus Töpfer</a>, former federal minister for the environment in Germany and former director of Unites Nations environmental program <a href="https://en.wikipedia.org/wiki/UNEP" class="extiw" title="w:UNEP">UNEP</a>. Picture by Christoph Streckhardt, supplied to me by himself under the CC-BY-SA-2.0 license.
Christoph Streckhardt
CC BY-SA 2.0
Email from C.Streckhardt who took the pictures at an event we both attended and provided them with CreativeCommons for my uploading