Agent Michael Stasiak is a federal agent who worked with and is often at odds with Brian O'Conner. However, despite their differences, he does covertly help Brian enter prison to obtain information from Arturo Braga in Fast & Furious 6.
Agent Stasiak is an FBI agent who is working alongside Brian O'Conner on the Braga case. However, he does not trust nor like him due to his criminal past. However, when Letty, who Brian sent in undercover to infiltrate Braga's operation, turns up dead, Dominic Toretto re enters the United States. Stasiak brings Mia Toretto in for questioning about Dom's possible whereabouts. Brian, however, interrupts the interrogation and releases Mia, resulting in Stasiak confronting Brian and questioning his loyalties. Brian proceeds to shove Stasiak's face into a wall; thereby breaking his nose.
Stasiak covertly helps Brian enter the prison under an alias (T. Bridges), in which Braga is being held so that he can obtain information about Owen Shaw; Stasiak only does so under the condition that he can be the one held responsible for bringing down Shaw. Stasiak is only able to get Brian into the general population of the prison whilst Braga is being held in solitary confinement. Stasiak suggests that Brian must do something to get into solitary confinement as well; therefore Brian attacks Stasiak, breaking his nose (in an identical fashion to Fast & Furious) in order to be placed in solitary confinement. After Brian obtains the information from Braga. Stasiak manages to arrange for his release before his fingerprints (which he gave upon entry) are scanned onto the national database, which would have exposed him for who he truly was.