The law firm Paul Weiss has hired a prominent Justice Department prosecutor in an effort to build a Washington practice that defends corporations accused of trying to gain business overseas through bribes.

Paul Weiss announced on Friday it had hired Mark F. Mendelsohn, deputy chief of the fraud section in the Justice Department's criminal division, who was the architect of an ambitious program to target foreign bribery.

Mendelsohn was the top catch for Washington law firms looking to continue to participate in the thriving Foreign Corrupt Practice Act business. The Justice Department and Securities and Exchange Commission have been filing aggressive cases in recent years against such companies as Halliburton, BAE Systems and Daimler, reaching settlements in the hundreds of millions of dollars.