Post 200 The guide to the region's top businesses

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Twin escalators lead from ground floor to second floor offices at Arnold and Porter's Washington office. (Tom Allen/The Washington Post)

Law and Lobby

Arnold & Porter

Arnold & Porter was founded by three veterans of the New Deal, including one, Abe Fortas, who would later become a U.S. Supreme Court justice. The firm has a reputation of hiring former senior officials from the White House, State and Justice departments. It has seven U.S. offices — Washington is its largest and oldest — and two abroad, in Brussels and London. In 2011, the firm hired a 13-lawyer patent litigation team in Washington and Los Angeles, and absorbed the California firm Howard Rice.


Arnold and Porter participated in 12 percent of the cases argued before the U.S. Supreme Court’s 2010-11 term: two successful petitions for certiorari, four merits cases (three unanimous victories and one 6-3 win), and numerous amicus curiae briefs.

555 12th St. NW

Washington D.C., 20004


Founded: 1946

Chairman: Thomas Milch, Managing partner: Richard M. Alexander

Employees (local): 1376 (908)

NOTE: Our methodology for the rankings.