PricewaterhouseCoopers (trading as PwC) is a global professional services firm headquartered in London, United Kingdom. It is the world's largest professional services firm and the largest of the "Big Four" accountancy firms measured by 2011 revenues.

PwC has offices in 771 cities across 158 countries and employs over 169,000 people. It had total revenues of $29.2 billion in FY 2011, of which $14.14 billion was generated by its Assurance practice, $7.63 billion by its Tax practice and $7.46 billion by its Advisory practice.

The firm was formed in 1998 by a merger between Coopers & Lybrand and Price Waterhouse. The trading name was shortened to PwC in September 2010 as part of a major rebranding exercise.

As of 2010^[update] PwC was the seventh-largest privately owned organization in the United States.

The PricewaterhouseCoopers name was formed by the combination of the names of Price Waterhouse and Coopers & Lybrand, following their merger in 1998. On 20 September 2010, PricewaterhouseCoopers rebranded as PwC, although the legal name of the firm remained PricewaterhouseCoopers.

Sheryl Kara Sandberg (born August 28, 1969) is an American businesswoman. She has served as the chief operating officer of Facebook since 2008. Prior to Facebook, Sandberg was Vice President of Global Online Sales and Operations at Google. She also was involved in launching Google's philanthropic arm Google.org. Prior to Google, Sandberg served as chief of staff for the United States Department of the Treasury. In 2012, she was named in Time 100, an annual list of the 100 most influential people in the world assembled by Time.

Sandberg was born in 1969 in Washington, D.C., the daughter of Adele and Joel Sandberg and the oldest of three siblings. Her family moved to North Miami Beach, Florida when she was two years old. She attended public school, where she was "always at the top of her class." Sandberg taught aerobics in the 1980s while in high school.

In 1987, Sandberg enrolled at Harvard College and in 1991, graduated with a B.A. in Economics and was awarded the John H. Williams Prize for the top graduating student in economics. While at Harvard, Sandberg met then professor Larry Summers who became her mentor and thesis adviser. Summers recruited her to be his research assistant at the World Bank, where she worked on health projects in India dealing with leprosy, AIDS, and blindness.