<a href="https://en.wikipedia.org/wiki/Steve_Chappell" class="extiw" title="en:Steve Chappell">Steve Chappell</a>, American aerospace engineer and NEEMO 14 aquanaut, climbing Mount Rainier.  From <a rel="nofollow" class="external free" href="http://www.nasa.gov/mission_pages/NEEMO/NEEMO14/chappell_bio.html">http://www.nasa.gov/mission_pages/NEEMO/NEEMO14/chappell_bio.html</a>. NASA photo in public domain (caption on source page reads "Image credit: NASA").