TIP No. 1. Use self-deprecating humor to lower barriers.

Unlike many other TED Talks speakers, Robinson doesn't have a dynamic physical presence. Furthermore, because he's an academic, he must overcome the perception that he's likely to deliver a boring lecture.

He therefore opens by poking a little fun at himself and at educators in general. By puncturing his own balloon, he makes everyone feel more comfortable and more likely to listen to what he has to say.

TIP No. 2. Tie your experience to the shared experience.

In the midst of his humor, Robinson relates his personal experience at the conference to that of the attendees. This further humanizes him and brings him into the community of the audience.

Robinson establishes such a strong rapport with the audience that he doesn't need visuals or graphics to make his points.  This is a testament to how well he manages to capture and then hold the audience's attention.