His name is Kevan Atteberry, at left in the shot below, and as you'll see he has mixed feelings about his achievement. Pride at having created such a familiar bit of iconography (and having done so on his Mac); chagrin at how his brainchild is viewed.
This is long, and casual viewers may want to skip to time 32:00 or so and hear Atteberry talk directly about those mixed feelings (plus some political jokes involving Clippy around time 34:00). But anyone who has worked on a design team or endured focus groups to guess at user/consumer reaction will find the whole presentation interesting. Atteberry was a consultant to Microsoft rather than an employee and describes the pressures and incentives from different blocs there.
Mainly it's touching to see how loyal he still is to Clippy.