Matthew Weitz is the current Director of the FBI, former Congressman and U.S. Attorney.
After the New York Office thwart two undercover hackers from stealing the non-official cover list, Weitz interrogated Mayfair, accusing her of murdering Alexandra Harrison, aka Donna Hollaran, and CIA Deputy Director Thomas Carter. His evidence for the respective cases is a large amount of cash Mayfair withdrew to supposedly pay Alexandra and the GPS data from her car leading towards where Carter's body was buried, enough to get her charged. Unbeknownst to Weitz, Mayfair was framed, as Jane Doe had planted the GPS data and hacked the FBI computers and Sofia Varma had tricked her into providing the money supposedly to help her flee the country.
#14 Rules in Defiance
#17 Mans Telepathic Loyal Lookouts
#21 Of Whose Uneasy Route
#8 We Fight Deaths on Thick Lone Waters
#18 Senile Lines
#5 This Profound Legacy
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#3 The Quantico Affair