Mary Ellen Callahan, the former chief privacy office for the agency, joins Jenner & Block as a partner in the firm's Washington office.
At the department, Callahan also served as the chief FOIA officer. Before joining Homeland Security in 2009, she was a partner at Hogan & Hartson.
Privacy practices are designed to help clients manage their information, whether it's customer data or other proprietary information. Callahan said the newly formed practice touches other practice areas like litigation, intellectual property and transactions.
"I'm seeing my practice as how information is gathered, disclosed, stored and destroyed — the whole process," Callahan said. "Any company in the world is going to have information and trying to figure out what are they going to do with it is the challenge."