The CEO membership of the Tugboat Institute, an organization for founders building long-term companies, includes a large proportion of introverts.

According to a recent study cited by Susan Cain, the most successful salespeople are often ambiverts, as they combine the extroverted ability to close deals with the introverted skill of active listening.

To overcome his fear of public speaking, a young Warren Buffett enrolled in a Dale Carnegie training class at age 21.