Brandon Van Grack, a member of former Special Counsel Robert Mueller III’s team who more recently led the U.S. Justice Department’s  crackdown on covert foreign influence campaigns in the U.S., has joined Morrison & Foerster as a partner focused on white-collar defense and national security matters, the law firm said Wednesday.

Van Grack’s arrival at the firm comes after more than a decade at the U.S. Justice Department, where he played a leading role in the investigation into Russian interference in the 2016 presidential election before heading a unit tasked with enforcing a federal law requiring the disclosure of lobbying and other political activities for foreign powers.