After presiding over the largest bankruptcy filing in U.S. history, former Southern District Bankruptcy Judge James Peck will become co-chairman of Morrison & Foerster’s global business-restructuring and insolvency group.

Peck, who will join as senior of counsel at MoFo on March 3, oversaw the Chapter 11 and SIPA cases of Lehman Brothers and its affiliates, which collectively held about $600 billion assets at the time of filing. He also presided over Chapter 11 cases of Iridium, Quebecor, Charter Communications, Extended Stay Hotels and ION Media. He retired from the bench last month and will co-chair the MoFo group alongside partner Gary Lee.

In an interview, Peck, 68, said he became more familiar with MoFo while conducting mediations in the Chapter 11 cases of MF Global and Residential Capital. MoFo represented debtor Residential Capital, while the firm represents former FBI Director Louis Freeh in his role as trustee for MF Global. “It was just a personal comfort level. I found it easy to work with them and it was a place I could be comfortable and happy in private practice,” Peck said. He said other firms approached him after he announced his retirement, but Peck said MoFo was “a good fit because of the people involved and because of the platform of firm” in the U.S., Asia and Europe.

Peck will work on domestic and cross-border cases and complex mediation matters. “As a result of the increasing multinational nature of businesses and globalization of capital, in the last six years we have seen the most complex cross-border and domestic bankruptcy and insolvency matters in history,” firm chair Larren Nashelsky said in a statement.

Before being appointed to the bench in 2006, Peck was a partner at Schulte Roth & Zabel’s business reorganization department.