This is source I found from another site, main source you can find in last paragraph

Mueller oversaw investigations of Panamanian leader Manuel Noriega, the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland, and Gambino crime family boss John Gotti, among other high-profile cases. But his tendency to command, rather than inspire, again came into sharp relief.

“He doesn’t invite disagreement,” said a former prosecutor who served under Mueller. “He’s an order-giver.”

He could be harsh on subordinates — sparking resentment when he referred privately to reassigning career lawyers as “moving the furniture.”

::

In 1993, at age 50, Mueller decided to try private practice again, joining Hale and Dorr as a partner in Washington, representing corporate clients.

The money was better, but Muller was unfulfilled. After two years, he returned to government service — signing on as a homicide prosecutor in the District of Columbia. It was a time of mayhem in the nation’s capital, made worse by the scourge of crack cocaine.

Mueller began working with a “cold case” squad, comprised of Metropolitan Police detectives and FBI agents, that sought to bring murderers to justice.

The squad sent applications for search warrants and subpoenas for Mueller’s review before seeking a judge’s approval. Unlike some prosecutors, Mueller “wouldn’t automatically give a signature,” recalled one of the investigators.

“He would ask, ‘Have you done your work? Do you have your facts?’ … He knew what he was asking was the way to make sure everything stood up” in court.

Building cases often entailed forging trust with victims, witnesses and suspects. Relating to both the sympathetic and the unsavory did not play to Mueller’s strengths.

“He was a gruff guy, and a lot of times, there wasn’t much warmth or ability to really build a bond or connect with a victim-witness,” said the same investigator. “There’s times when you’ve got to bond with the suspect to get what you need. His personality wasn’t necessarily the best for that.”

Nor was Mueller an easy fit with juries in Washington, especially in the freewheeling local Superior Court, where decorum is typically below what judges demand in U.S. District Court.

“In D.C. Superior Court, it’s a bit like meatball surgery. It’s a bit like a M.A.S.H. unit — it’s the unexpected,” said one of Mueller’s former colleagues. “His strength was not as a M.A.S.H. unit trial lawyer.”

Mueller, a registered Republican, moved back to San Francisco in 1998 after President Clinton appointed him U.S. attorney for the Northern District of California. In July 2001, President George W. Bush nominated him as FBI director, and he won unanimous Senate confirmation. Mueller asked the White House for a delay, however, so he could undergo treatment for prostate cancer.

His first day on the job was Sept. 4, 2001 — a week before hijacked airliners slammed into the World Trade Center, the Pentagon and a field in Pennsylvania in the worst terrorist attack in U.S. history.

At 7 a.m. Sept. 12, Mueller, then-Atty. Gen. John Ashcroft and other officials arrived for an emergency briefing at the FBI’s operations center. The senior agent had been given an hour to prepare while investigators were still combing airline manifests and scouring crash sites.

When Mueller asked a rapid-fire series of questions, the agent replied that accurate information was not yet “established.”

“ ‘I want answers, goddamn it!’ ” Mueller exploded, an official who was present recalled.

Mueller already was coming under siege from critics who questioned why the FBI had not prevented the 9/11 attacks. Fear spread of a “second wave” terrorist strike.

Robert Mueller
Emilie Sommer / AFP

This is source I found from another site, main source you can find in last paragraph

Source : http://www.latimes.com/politics/la-na-pol-mueller-record-20171122-story.html

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