<a href="https://en.wikipedia.org/wiki/Kenneth_E._Iverson" class="extiw" title="w:Kenneth E. Iverson">Kenneth E. Iverson</a> and <a href="https://en.wikipedia.org/wiki/Arthur_Whitney_(computer_scientist)" class="extiw" title="w:Arthur Whitney (computer scientist)">Arthur T. Whitney</a>. Permission granted by Rob Hodgkinson, who created the photo.
<a rel="nofollow" class="external text" href="http://marketgridsystems.com/about-us/">Rob Hodgkinson</a>
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Private correspondence