Global consulting firm.

"McKinsey serves companies in every business sector and industry. We also work with many governments, institutions, and nonprofit organizations. We form enduring client relationships: more than 80 percent of our work is with clients whom we've served before.

McKinsey is a meritocracy. We hire talented individuals from the world's top schools as well as from industry, foster their personal development, and encourage outstanding performers to advance."

www.mckinsey.com (Also recommended: Their online journal at mckinseyquarterly.com)