NASA Station Training Lead and NEEMO Mission Director and aquanaut <a href="https://en.wikipedia.org/wiki/Marc_Reagan" class="extiw" title="en:Marc Reagan">Marc Reagan</a>.  From <a rel="nofollow" class="external free" href="http://quest.arc.nasa.gov/people/bios/space/reagan.html">http://quest.arc.nasa.gov/people/bios/space/reagan.html</a>.  NASA photo in public domain.