Covington & Burling, with its deep expertise with transactions, often finds itself involved in some of the biggest mergers and acquisitions, financing projects and professional sports deals. During the past 1 1/2 years, Covington has brokered deals for AstraZeneca PLC, Abbott Medical Optics Inc., Tribune Co., Potomac Electric Power Co. and Time Warner Cable Inc.

"We handle a lot of the company acquisitions, but we also do product acquisition and divestitures, and joint ventures," said Catherine Dargan, co-chairwoman of Covington's mergers and acquisitions practice. "We advise clients across a broad array of industries and have developed a depth in many sectors by coordinating closely with lawyers in our industry and regulatory groups."