SAN FRANCISCO — Melinda Haag, the former U.S. attorney for the Northern District of California, is rejoining Orrick, Herrington & Sutcliffe, the firm where she previously helped build the white-collar defense practice. Haag, who is set to return to the firm on March 1, will serve as the leader of Orrick’s 330-lawyer global litigation group.

Haag, who wrapped up her five-year tenure as the Northern District’s top cop in September and oversaw the work of 130 federal prosecutors, said she has missed practicing law. “I missed being in court myself. I missed advising clients. And I certainly missed being in trial,” said Haag, 54.