Data:
540 lawyers, 10 offices, including its HQ in San Francisco, New York, London and Tokyo. Chairman: Ralph Baxter.

History:
Orrick Herrington & Sutcliffe traces its roots back 137 years. The firm helped put together the Pacific Gas & Electric Company, which remains one of its top clients.
Chairman Ralph Baxter took over the firm in 1990 and began pushing the firm toward ambitious expansion goals, in particular building up Orricks’s New York office.