Jennifer O’Connor has joined the White House Counsel’s Office as a lawyer who often plays a key role in crisis control and prevention, the administration is expected to announce Friday afternoon.

The former Wilmer Cutler Pickering Hale and Dorr partner will already be up to speed on some of the challenges facing President Barack Obama when she becomes deputy White House counsel. O’Connor left the firm in May 2013 to help the Internal Revenue Service navigate accusations that the agency improperly targeted political groups that applied for tax-exempt status.