David Shapiro has rejoined PricewaterhouseCoopers' Washington National Tax Services practice as a principal in its International Tax Services group, in Washington, D.C., the firm announced. Shapiro, who has broad expertise in both international tax planning and the taxation of financial transactions, was formerly an ITS principal in the practice from 2005 to 2007.

Most recently, Shapiro served in the Office of Tax Policy at the United States Treasury. While at the Treasury, he was primarily responsible for tax issues and published guidance related to domestic and cross-border financial products and transactions. Shapiro was also heavily involved in developing tax policy, guidance and legislation surrounding the government’s response to the liquidity crisis.

Shapiro is an adjunct professor of law in Georgetown University's LL.M. Program in Taxation, where he teaches a course on international tax. He actively participates on the financial transaction tax committees of the American Bar Association and the D.C. Bar Association, most recently serving as chairman of the D.C Bar committee before resigning upon his appointment to the Treasury.