The first step to becoming a professional with staying power is to understand how top executives plan their careers. I studied their answers to questions like, How early did you know what you wanted to be in life? How focused were you on particular career goals? How big a role did luck play in your success? How did you know when to make your move? How have you handled failures or setbacks? Here are the fascinating answers that invincible executives gave to these and other questions about their career paths.