Robert S. Mueller III, is the former FBI director who has served under two presidents. He is best known for heading the special counsel that is currently investigating possible collusion between the Trump campaign and Russia. Mueller took the reigns as FBI director, a week before the horrific September 11, 2001 terror attacks. All of the information used in this article comes from Wikipedia.

His career spanned 13 years and he worked at restoring the public's trust in the agency.

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Mueller entered the FBI, which had been tarnished by the events at the Branch Davidians compound in Waco Texas, the discovery of an agent turned Russian spy within the ranks, and the discovery that some documents were withheld from Oklahoma City bomber Timothy McVeigh lawyers.

Mueller exited the agency in 2013 and managed to garner praise from both parties including Republican Sen. Chuck Grassley. Among everything he has done, these are the five things you should know about Mr. Robert S. Mueller III.

1. Robert Mueller III has a long record of public service

Robert Mueller is a United States veteran, serving several years in the military. He served as an officer in the US Marine Corps for three years. He was deployed to Vietnam, where he led a rifle platoon. He received several medals for his actions in Vietnam, including the Purple Heart. Robert Mueller spent a large amount of time in the legal field. He spent 12 years serving in several US attorney offices.

Mueller got back into government service in 1990 when he was tapped to become the head of the DOJ's criminal division. He eventually became the US attorney for the northern district of California.

In 2001, President George W. Bush appointed him the next FBI director.

2. Mueller is the second longest serving director of the FBI

Mueller's time as FBI director spanned 13 years, from 2001 to 2013. This is beyond the imposed 10-year limit. The limit was put in place to prevent directors from serving as long as 50 years, which J. Edgar Hoover managed to do. As Mueller was about to leave at the 10-year mark, President Barack Obama requested he stay in order keep the agency stable, while the FBI dealt with ongoing security threats.

3. Mueller received strong praise for his work as director

Mueller became the FBI director, just a week before the deadly September 11, 2001, terror attacks. Following the devastating attacks, Mueller worked at changing the way the agency operates. Mueller turned the FBI into an agency that focused on intelligence and thwarting crimes instead of just responding to the aftermath. Following the attacks, Mueller managed to transform the head law enforcement agency, into an intelligence-driven agency.

Mueller worked to change the agency into one that thwarted crimes and attacks instead of responding to them.

4. Robert Mueller avoids the spotlight

As Robert Mueller took on the role of FBI director, during one of the most important periods of American history, Mueller managed to keep a low profile and avoid the public spotlight. Mueller refused to travel with an entourage and refused to do interviews. Many say he worked from sun up to sun down.

5. Tapped by the NFL

Despite being retired, the National Football League requested Robert Mueller III, head an investigation into claims that certain NFL officials obtained and reviewed a video of at the time running back Ray Rice beating his fiance in an elevator. Mueller started working after the NFL suspended Ray Rice for two games. The video was somehow released by TMZ, creating a national outcry, over the NFL's actions. Mueller ended up reporting that nobody at the NFL watched the tape prior to the suspension being placed on Rice.