Wil Wheaton to speak at Macworld Expo SF (MacCentral) MacCentral - IDG World Expo on Tuesday announced that actor, author and self-described geek Wil Wheaton will deliver "a special feature presentation" entitled "Just a Geek" at the upcoming Macworld Conference  amp; Expo in San Francisco, Calif. Macworld Expo takes place at the Moscone Center from January 10 - 14, 2005, and Wheaton's presentation will take place on January 13 at 9:30 AM. There will be a book signing after his presentation.