Robert Mueller is an American attorney and former government official, best known for serving as the Director of the Federal Bureau of Investigation (FBI) from 2001 to 2013. He was appointed to oversee the investigation into the September 11 attacks and played a key role in enhancing national security measures during his tenure. In 2017, Mueller was appointed as a special counsel to investigate potential interference by Russia in the 2016 United States presidential election. His investigation led to the release of the Mueller Report, which detailed findings on Russian activities and potential connections to the Trump campaign.