You have to practice what you preach and go on to the next opportunity, Neeleman said. "Whether it's a master plan or not, there are things you couldn't have done without overcoming that crucible," said Patricia Dunn, former chairman of the board at Hewlett-Packard. Dunn faced accusations related to corporate espionage, but was acquitted of all charges. During that time, Dunn was also battling a recurrence of ovarian cancer. "To be in a leadership position - takes fundamental optimism," said Dunn, who now focuses on philanthropic activities.