Peter Strzok - Wikipedia

After high school in Minnesota,[5] Strzok graduated from Georgetown University in 1991, and in 2013 received a master’s degree there.[6] Strzok was an officer in the U.S. Army and then an intelligence research specialist in the FBI.[7]

He has worked at the FBI since the 1990s, is "considered one of the most experienced and trusted FBI counterintelligence investigators", according to The New York Times,[8] and is "considered to be one of the Bureau's top experts on Russia", according to CNN.[4] He served as the deputy head of FBI counter-intelligence[3] and worked on secret matters of espionage involving China and Russia.[7]

Lead investigator on high-profile cases

Starting on July 10, 2015, Strzok led a team of a dozen investigators to examine Hillary Clinton's use of a private email server.[9] During the investigation, Strzok changed then-FBI Director James Comey's draft language describing Clinton's actions as "grossly negligent" (which may be a criminal offense) to "extremely careless".[4] Strzok and his team helped review newly discovered Clinton emails days before Election Day.[9]

In July 2016 Strzok signed a document opening the FBI's investigation into Russian interference in the 2016 United States elections.[4][10] He oversaw the bureau's interviews at this time with then-National Security Advisor Michael Flynn.[11] Strzok also became the top FBI agent working for Robert Mueller's special counsel investigation of foreign electoral intervention by Russia in the 2016 U.S. presidential election.[12]

Removal from Mueller investigation

In late July 2017, Strzok was removed from Mueller's team and moved to a human resources position at the agency after reports of text messages transmitted between Strzok and Lisa Page, who worked at the FBI for Deputy Director Andrew McCabe; the text messages appeared to be anti-Donald Trump in nature.[13][14] According to Strzok's colleagues and a former Trump administration official, Strzok had not previously shown any overt political bias.[2][13] An associate of his says the political parts of the text messages were especially related to Trump's criticism of the FBI’s investigation of the Clinton emails.[2] Page was assigned to Mueller's investigation as a trial attorney until she left in late September 2017.[15][16]

Strzok's and Page's colleagues in the FBI said that there was no professional misconduct between Strzok and Page.[13] According to The Wall Street Journal, several agents said that Mueller removed Strzok in order to protect the integrity of the special counsel’s Russia investigation.[17]

Subject of ongoing investigation

Michael E. Horowitz, the Inspector General (IG) of the Justice Department, has an ongoing investigation into how the FBI handled the high profile investigations.[8][18] Fox News reported that a source close to the probe says it will examine Strzok's participation in various other politically sensitive matters, and that the proble should be done by "very early next year."[19] The IG investigation began in January 2017, and Horowitz expects to issue a report in March or April of 2018.[8] Meanwhile, the Justice Department has agreed to allow the United States House Permanent Select Committee on Intelligence to interview Strzok.[20]