Framingham, Mass.—IDG World Expo President-CEO David Korse announced he’s leaving the company, effective Nov. 3. A successor is expected to be named shortly. Korse, who has been with IDG since 2003, said he’s returning to his home state of California. Before joining IDG, he was president-CEO of Imark Communications, which produces IT events. IDG World Expo produces the Macworld Conference & Expo, among other technology events.