Here's your chance to chat with the business leaders of yesterday and today. Harold Geneen says that if you have to pull rank, you're no leader. J. Paul Getty believes that true leaders not only know how to battle crises, they enjoy them. Robert Haas emphasizes the need for having core values and principles if you are to be a great leader. Others heard include the Washington Post's Katherine Graham, John Patterson, who founded the National Cash Register Co. more than a century ago, and McDonald'