The best white-collar defense lawyers pride themselves on staying out of the spotlight — of making the client's problems quietly go away. Still, Lanny Breuer's return to Covington & Burling in March after four years at the U.S. Department of Justice was cause for just a little public celebration.

Breuer left the firm in 2009 to serve as assistant attorney general for the Criminal Division, overseeing teams of prosecutors in high-profile fights ranging from mortgage and health-care fraud to international money laundering. Covington's white-collar defense practice co-chairman Bruce Baird described Breuer as a major addition to the firm's already sizeable stable of former prosecutors.