A HARVARD TEAM OF ORGANIZATIONAL DEVELOPMENT consultants did a sampling of nearly 14 years covering 2000 Chief Executives of global companies listed by S&P. The sampling and tests were fairly exhaustive and unique, and presented a vivid picture of the Executive boardrooms that saw many major global economic events including the Y2K IT burst, Oil-price surge and dive, and 2007-down-turn, among others. Though the headline making "attribute" of the published list came out highlighting that three of top 5 best performing executives do not have a formal degree in management. Three of the top five are connected to IT industry, and the other two are from petroleum and energy sector. Broadly, four out of 10 successful leaders in IT and six out 10 in energy sector do not possess such formal b-school enrollment.