Elizabeth Prelogar, a rising star at the U.S. solicitor general’s office who also played a key role in Robert Mueller’s special counsel team from 2017 to 2019, has left government to join the Cooley law firm as a litigation partner in Washington.

Prelogar, who departed from the solicitor’s office in November after her seventh Supreme Court argument, starts work at Cooley today, with a goal of building a Supreme Court practice as well as tackling white-collar, technology, privacy and government investigation matters.