Shawn Achor is a positive psychologist and author who gave a presentation focusing on linking happiness to success in business and everyday life. He started with a humorous anecdote about his childhood to engage the audience and maintained their attention with quotes. His optimistic and engaging delivery style helped convince the audience of his ideas about positivity. The document provides analysis of Achor's speaking techniques and tips for how to improve one's own delivery, such as practicing and maintaining a positive attitude.