If you're going to be a thought leader, you must convince.
If you're ever in the position of giving a presentation or of convincing an audience - even of one - of your position, you'll want to learn how to tell a tale. Storytelling is a cornerstone of any good presentation and learning to convince others of your point is a necessity.
Duarte Design is the force behind a host of powerful presentations. (If you're ever putting together a presentation you should take a look at how the great ones are built.)
More advice on how to present. Guy Kawasaki is a well know speaker and author and nails it with his 10 - 20 - 30 rule.