Journalist Malcolm Gladwell has written a number of best-selling books, including Blink, The Tipping Point, Outliers, What the Dog Saw, and most recently, David and Goliath: Underdogs, Misfits, and the Art of Battling Giants. You can read a lot of his articles online at The New Yorker, such as this piece about college rankings: “The Order of Things: What College Rankings Really Tell Us.”
In a 2010 interview, Sarfraz Manzoor asked Gladwell about his public speaking career. Gladwell replied that “Speaking is not an act of extroversion. People think it is, but it has nothing to do with extroversion. It’s a performance, and many performers are hugely introverted.”
The part about extroversion begins at 2:10.