Five partners and up to 15 associates and counsel are leaving Willkie Farr & Gallagher effective January 1 to take in-house jobs with one of the firm’s largest clients, Bloomberg L.P., the company announced Thursday. In the process, Bloomberg L.P. is getting a new chief legal officer: Willkie corporate partner Richard DeScherer, a longtime confidant of company founder Michael Bloomberg.

Other Willkie attorneys accompanying DeScherer to Bloomberg include corporate partners and information systems and technology cochairs Dan Grossman and Carol Mascera, as well as corporate partners David Levine and Sarah Osborn. Willkie cochairman Steven Gartner says that the specific number of associates and counsel joining Bloomberg will be decided over the next few weeks.