The man in charge of investigating Trump/Russia collusion once taught cybersecurity at Stanford.
And he also worked in the US Attorney's office in San Francisco, specializing in computer crime.
He has a pattern of giving up lucrative, prestigious jobs for jobs that he thinks are more important. The worst that some of his critics seem to have said about him is that he's a "martinet" and "overbearing." 
I think his background makes him a great fit for Special Counsel. And he doesn't have to worry anymore about getting "jittery" from not working.
https://www.pds.org/journal-spring-2017/~post/alumni-achievement-award-robert-s-mueller-iii-pcd-59-20170503
If Bob Mueller had liked organic chemistry better, his life, and the direction of the nation's top law enforcement agency, would have been very different. He grew up wanting to be a doctor but during his senior year at Princeton University, the advanced math and science requirements caused him to reconsider. As a result, he went into law and became the Federal Bureau of Investigation's longest-serving and most influential director since J. Edgar Hoover. He took office in September 2001, just a week before the terrorist attacks of 9/11. Shortly before the end of his 10-year term, President Obama asked and received Congressional approval for unprecedented special legislation that extended his term another two years.
The responsibility and the pressure of those years were unrelenting, but Mr. Mueller feels he was well prepared. "The most formative experience I had early on was the Marine Corps," he says. "For preparing you for life and leadership, there's no better educator than military service and, particularly, the Marine Corps."
During the Vietnam War, he led a platoon based in the dense jungles along the Ho Chi Minh Trail. In December 1968, he received a Bronze Star for his "courage, aggressive initiative and unwavering devotion to duty" in a firefight in Quang Tri province. He also received the Purple Heart, two Navy Commendation Medals, and the Vietnamese Cross of Gallantry.
"Having lived for a year in Vietnam, and survived, meant that everything else was downhill after that," he says. "You learn how to operate under pressure; you just don't worry that much. If you spend a year in the jungle, you get used to that kind of situation and it's not that alien to you when the unexpected happens."
SNIP
Mr. Mueller says he gets "jittery" when he is not working so, after stepping down as Director of the FBI in 2013, he became a visiting professor at Stanford University where he taught cybersecurity.
http://content.time.com/time/nation/article/0,8599,166567,00.html
After President Bush's defeat in 1992, Mueller accepted a partnership in the blue-chip Boston law firm of Hale and Doar. To the surprise of his former associates, in 1995 he applied for a position in the homicide section of the U.S. Attorney's office in the District of Columbia. This was a huge comedown for a man who had supervised 900 Justice Department prosecutors, but Margolis says Mueller was caught up in the idealism of public service, explaining, "There's just too many young people dying violently in this city, and I want to do my share to put an end to that. I feel I'm obligated."
Meanwhile, his wife Ann was a teacher specializing in helping children with learning problems at a private school in Washington. Mueller became chief of the U.S. Attorney's office's homicide section where his reputation as a passionate prosecutor came to the attention of Janet Reno, who in 1998 asked him to go to San Francisco to beef up the U.S. Attorney's office, which was then beset by burgeoning computer crime.
Early this year, the Bush transition team asked Mueller to return to Washington temporarily to serve as acting Deputy Attorney General — the day to day chief operating officer of the Justice Department — until Larry Thompson could be confirmed as the permanent Deputy. "He worked with a number of people in Justice and gained their confidence as someone who was capable of running the FBI and also someone who the department could work with," says Thompson.
Thompson says Ashcroft's team was especially impressed by Mueller's extraordinary 1995 decision to abandon a lucrative private practice to take obscure murder cases in DC's hellish Superior Court. "He's not a person who's all that concerned about his ego," says Thompson. "He doesn't need to have a high-profile position to determine his self-worth."
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