How can you manage shyness?

According to psychotherapist doctor Philip Zimbaro, it is possible through training and exercise to push shyness back to a manageable level. He describes this in his book Shyness, what it is, and what can I do about it. Charismatic leaders overcome shyness by boldly approaching and addressing people. Observe Barack Obama, Harry Windsor or Hillary Clinton. For her standard work What am I saying now? Susan Roane interviewed hundreds of heroes of conversation. 75% said they are still downright shy. But they do it anyway: go up to someone and start a conversation. Why? They think it works. They put others at ease with it. It makes them feel comfortable. They get results.