Lanny Breuer, who was the Assistant Attorney General for the Criminal Division of the U.S. Department of Justice under President Obama, conceded in a recent PBS documentary that “no Wall Street executives” were prosecuted under his tenure.

Now we know one reason why Breuer may’ve been so soft on the Big Banks. He has just announced that he will be returning to Covington & Burling, a white collar defense law firm that “represented corporations that were investigated by the criminal division” of the Department of Justice.

Ethics law prevents him from “appearing before the DOJ on a client’s behalf for two years. He can, however, counsel a client on a new matter before the department from behind the scenes.”

Breuer isn’t the only big get for the firm this year. Former Republican Senator Jon Kyl (AZ) and former Democratic Rep. Howard Berman (CA) both joined the firm’s lobbying practice recently. It also happens to be the firm that Attorney General Eric Holder — who notoriously failed to hold banks accountable as well — worked at.

UPDATE: The American Bankers Association was one of the firm’s clients in 2012, giving it $40,000. Wells Fargo was as well, giving it $120,000.

WARREN: So you have made a decision to protect the banks but not a decision tell the families who have been illegally foreclosed against?

RICHARD ASHTON (FEDERAL RESERVE): We haven’t made a decision about what information we would provide to individuals. [...]

WARREN: So I just want to make sure I get this straight. Families get pennies on the dollar in the settlement for having been the victims of illegal activities or mistakes in the banks’ activities. You now know individual cases where the banks violated the law and you’re not going to tell the homeowners or at least it’s not clear if you’re going to do that?