This guy is more than qualified. Here's a snip from his bio:
Before coming to Jenner & Block in 1997, Mr. Gershengorn served for two years in the U.S. Department of Justice, first as Special Assistant and Counsel to Deputy Attorney General Jamie S. Gorelick, and then as Assistant to Attorney General Janet Reno. At the Justice Department, Mr. Gershengorn worked on a variety of civil and civil rights matters, and also coordinated the Department's responses to the Judicial Conference of the United States, the American Bar Association, and other organizations on rules-related issues.
Full "bio" listing is here.
Big name firms took the RIAA/MPAA cases, so it's not surprising that many of these top lawyers are getting positions in the Justice Dept. While I'm completely against the RIAA/MPAA tactics, how many lawyers would turn down the payday they were throwing their way?