question: What is the first name of the man that runs the task force with the secretive person?
context: In Chandler, Arizona, FBI agents Kate Macer and Reggie Wayne lead a raid on a suspected Mexican cartel safehouse, where they discover dozens of hidden decaying corpses and a booby trap that kills two policemen. Following the raid, Kate's boss recommends her for a Department of Justice special joint task force, overseen by Matt Graver and the secretive Alejandro Gillick, to apprehend the Sonora Cartel lieutenant Manuel Díaz. Assured that the task force will bring Díaz and those responsible for the safehouse incident to justice, Kate enlists in the operation. 
  The team travels in force to Ciudad Juárez, Mexico, to extradite Díaz's brother and henchman Guillermo Díaz. To preempt an ambush, the team kills several Mexican cartel gunmen at the public border checkpoint, shocking Kate. Alejandro tortures Guillermo and learns that the cartel uses a tunnel to smuggle drugs into the U.S.
  Reggie and Kate begin to question the task force's illegal and seemingly inexplicable methods. Finally, Matt reveals that the objective is not to apprehend Díaz, as originally suggested, but to disrupt his drug operations to such a degree that Díaz will be summoned back to Mexico by his boss, the elusive Sonora Cartel drug lord Fausto Alarcón. By following Díaz, they plan to bring Alarcón to justice.
answers.text: Matt