Stuart Diamond Stuart Diamond has taught and advised on negotiation to corporate and government leaders in more than 40 countries. He teaches negotiation and entrepreneurship at Wharton Business School, ranked #1 globally by The Financial Times, where he runs the most popular course. Diamond is president of Global Strategy Group, which advises companies and governments on negotiating, and also chairman and CEO of Four Star Airlines. He has consulted extensively for the United Nations, and as a journalist at The New York Times his team won the Pulitzer Prize.