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Robert Mueller is leading the investigation into Russia's interference in the 2016 elections, which on Thursday has officially gone on for a year.
That probe is also examining whether the Trump campaign colluded with the Kremlin, and if President Donald Trump has obstructed justice while in office.
In Washington, Mueller has a reputation for being a tenacious investigator. Both Republicans and Democrats welcomed his appointment last May with bipartisan backing.
But the increasing breadth and length of his investigation has irked many Trump supporters, and the president himself.
Mueller's colleagues, meanwhile, say he has proven his bipartisan bona fides over the years. After all, he served under both Republican and Democratic presidents as FBI director and as an attorney in the Department of Justice.
As the probe into Trump and his associates wages on, here's a look at Mueller's history:Born Robert Swan Mueller III in New York City in 1944, "Bob" grew up in the suburbs of Philadelphia, the elder brother to four younger sisters. Their father was an executive at DuPont. He captained the soccer, hockey, and lacrosse teams in high school. Dennis Cook/AP
Mueller went to undergrad at Princeton University, got his Master's in international relations from New York University, and graduated from the University of Virginia School of Law in 1973. University of Virginia School of Law/Facebook
When one of his friends died in the Vietnam War, Mueller was inspired to join the military. He had been previously pursuing a career in the medical field. AP Photo/Andrew Harnik
Source: Princeton Alumni Weekly
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See Also:Mueller issues grand jury subpoenas to Roger Stone's social media consultantMueller's team has told Trump's lawyers they can't indict a sitting president, Giuliani saysSenate intel panel breaks with Trump and House Republicans, concludes Russia meddled in the 2016 election to help Trump and hurt Clinton