It is important to note, this is not a special prosecution team, it is a legal investigative team. All three lawyers have formally resigned their positions, which is required from the law firm Wilmer Cutler Pickering Hale and Dorr.
From the National Law Journal in part: Zebley was Mueller’s former chief of staff at the FBI and Quarles worked as an assistant special prosecutor for the Watergate investigation. Mueller worked on a range of issues including cybersecurity, criminal litigation and internal investigations. Last year, he was appointed to oversee settlement negotiations in class action lawsuits over Volkswagen A.G.’s emissions scandal.