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 Six.
Fast and Furious
Agent Stasiak is working as an FBI agent alongside Brian on the Braga case. However, he does not trust nor like him due to his criminal past. Stasiak brings Mia Toretto in for questioning about Dom 's possible links to Braga's
illegal operations. Brian, however, interupts the interrogation and releases Mia resulting in Stasiak confronting Brian and questioning his loyalties Brian proceeds to shove Stasiak's face into a wall; breaking his nose.
Fast and Furious 6
Stasiak covertly helps Brian enter the prison in which Braga is being held so that he can obtain information about Owen Shaw and ultimately so Stasiak 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 his attention, 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 releases him from the prison.