Deloitte LLP

In the United States, Deloitte LLP and its subsidiaries have 80,000 professionals with a single focus: serving their clients and helping them solve their toughest problems. Deloitte works in four key business areas — audit, consulting, tax, and risk & financial advisory — but their real strength comes from combining the talents of those groups to address clients’ needs. Fortune and Working Mother consistently rank Deloitte among the best places to work.