Wow, Ben Shneiderman looks so young in that photo. He's still hard at work making computers easier for people to use, and he just published a major update to his classic book, "Designing the User Interface: Strategies for Effective Human-Computer Interaction", which just went to the printers and will be available on April 26. [1]
I enjoyed working with him at the University of Maryland Human Computer Interaction Lab, and the experience deeply influenced everything I've done since.
Ben is the human who suggested the field be called "Human Computer Interaction" instead of "Computer Human Interaction", to put humans first.
He defined the term Direct Manipulation [2] as:
1) continuous representation of the objects and actions,
2) rapid, incremental, and reversible actions, and
3) physical actions and gestures to replace typed commands.
He also came up with the blue underlined hypertext link, as well as embedded graphical links [3] for the "HyperTIES" system [4].
Here's a paper I published when I was at HCIL, about a visual PostScript programming environment that featured "direct stack manipulation": "The Shape of PSIBER Space - October 1989". [5]
Ben's an avid photographer, and has published this photo history of SIGCHI conferences. [6]
[1] http://www.amazon.com/Designing-User-Interface-Human-Compute...
[2] https://en.wikipedia.org/wiki/Direct_manipulation_interface
[3] https://www.youtube.com/watch?v=fZi4gUjaGAM
[4] http://www.cs.umd.edu/hcil/hyperties/
[5] http://www.donhopkins.com/drupal/node/97
[6] http://www.sigchi.org/photohistory/lib_viewer.jsp?lib=chi