Here's a name plenty of high-profile clients have banked on: Cahill Gordon & Reindel. The firm's roster of clients has included investment banks such as Goldman Sachs, J.P. Morgan Chase, and Merrill Lynch, as well as commercial banks and big companies from a variety of other industries. The firm maintains a broad range of practice areas; among its specialties are corporate transactions, intellectual property, litigation, media law, and tax. Cahill, which has about 300 lawyers, has offices in New York; Washington, DC; and London. The firm was founded in 1919.