PricewaterhouseCoopers LLP, the U.S. arm of the Big Four accounting firm, traces its history to mid-19th century London. It became a global auditing, tax and consulting giant following the 1998 merger of Price Waterhouse and Coopers & Lybrand. PricewaterhouseCoopers Interna­tional's global revenues of $31.5 billion in 2012 were the largest among the Big Four that audit the largest multinational companies. Its U.S. unit is the firm's largest and has 2,700 partners and 35,000 employees. PwC's international network of firms has offices in 158 countries.

LEGAL TEAM

Diana Weiss, a former partner in King & Spalding's Washington office and at Orrick, Herrington & Sutcliffe, was the company's outside ­counsel until 2012. She moved in-house that year following the death of the previous general counsel, Charles William Gerdts III. Weiss oversees a department of 75 people, including 40 lawyers and forensic accountants. They are organized into three groups: litigation, corporate and regulatory and counseling. "This is definitely challenging work," Weiss said. "It's not: Pick up the phone, call outside counsel and go home."

OUTSIDE COUNSEL