Question: Who is erin reagan's boss on blue bloods?

Disambiguated questions and answers:
context: Erin is divorced from John "Jack" Boyle (Peter Hermann), a criminal defense attorney, whom she met when they were 19. In "Old Wounds", she finally changes her name from Erin Reagan-Boyle back to Erin Reagan. Since her divorce, Erin has had a few romantic interests. She and her boss, District Attorney Charles Rosselini (Bobby Cannavale), flirted with each other and even shared a kiss after a date, but nothing ever came of it mainly due to Erin's reluctance with the idea of dating her boss. In 2011, she met Jacob Krystal (Fred Weller) at an art gallery; she later learned that he was an art thief who returned once-stolen works to their rightful owners, and he left town. In 2013, after being shot in a courtroom hostage situation, she started up a fling with her ex-husband Jack but broke up when they started getting serious again (lest he break her heart again, or their daughter find out that they were once again "hooking up"). In 2014, she met Robert McCoy, a defense attorney, on a speed-date, and the two became romantically involved until he was appointed interim District Attorney, at which point she said she can't sleep with her boss.
question: Which character is erin reagan's boss on blue bloods?
short_answers: District Attorney Charles Rosselini

Charles Rosselini
wikipage: List of Blue Bloods characters

context: Erin is divorced from John "Jack" Boyle (Peter Hermann), a criminal defense attorney, whom she met when they were 19. In "Old Wounds", she finally changes her name from Erin Reagan-Boyle back to Erin Reagan. Since her divorce, Erin has had a few romantic interests. She and her boss, District Attorney Charles Rosselini (Bobby Cannavale), flirted with each other and even shared a kiss after a date, but nothing ever came of it mainly due to Erin's reluctance with the idea of dating her boss. In 2011, she met Jacob Krystal (Fred Weller) at an art gallery; she later learned that he was an art thief who returned once-stolen works to their rightful owners, and he left town. In 2013, after being shot in a courtroom hostage situation, she started up a fling with her ex-husband Jack but broke up when they started getting serious again (lest he break her heart again, or their daughter find out that they were once again "hooking up"). In 2014, she met Robert McCoy, a defense attorney, on a speed-date, and the two became romantically involved until he was appointed interim District Attorney, at which point she said she can't sleep with her boss.
question: Which actor is erin reagan's boss on blue bloods?
short_answers: Bobby Cannavale

Robert Michael Cannavale
wikipage: List of Blue Bloods characters

Long answers:
knowledge: content: Robert Michael Cannavale (/ˌkænəˈvɑːli/; born May 3, 1970) is an American actor.
wikipage: Bobby Cannavale

content: Blue Bloods is an American police procedural drama television series that has been airing on CBS since September 2010.
wikipage: Blue Bloods (TV series)
long_answer: The character who is Erin Reagan's boss on the CBS television series Blue Bloods is District Attorney Charles Rosselini, who is played by American actor Robert Michael Cannavale.