Tom Selleck is unquestionably the heart of Blue Bloods. His portrayal of Police Commissioner Frank Reagan grounds the series with quiet authority, moral conviction, and a commanding presence. But what many viewers don’t realize is how deeply Selleck’s own personality, habits, and dedication to authenticity influence the show behind the scenes.
For starters, Selleck’s iconic mustache practically a character in its own right was never a requirement for the role. When he was cast, producers left the choice up to him, and Selleck opted to keep it, having long embraced it through roles like Magnum, P.I. Fans quickly agreed that Frank Reagan simply wouldn’t be Frank without it.
Selleck is famously meticulous about how law enforcement leaders are portrayed. With years of experience playing military and police figures before Blue Bloods, he brings a unique understanding of how real-world leaders carry themselves under pressure. He regularly collaborates with the writers to ensure Frank’s decisions and behavior feel true to established protocol. While the show prioritizes drama over documentary accuracy, Selleck consistently advocates for respectful, balanced storytelling about the NYPD.
He also brings a surprising amount of physical commitment to the role. Though Frank Reagan isn’t leaping off buildings or racing through the streets, Selleck well into his 70s still performs many of his own subtler stunts. Tactical movements, weapons handling, and navigating intense crowd scenes are all elements he approaches with discipline and realism.
Selleck’s influence extends to the show’s depiction of leadership as well. He has said that a police commissioner must project calm even in tense moments, a principle reflected in Frank’s steady voice, purposeful pauses, and deliberate delivery. His preference for fewer, more meaningful words has become one of the character’s defining traits.
Equally important is his commitment to the ensemble. Behind the scenes, Selleck often requests script changes not to expand his own role, but to ensure that other characters’ perspectives are fully represented. In his view, a show centered on law enforcement requires a wide range of voices 
not just that of the commissioner.
Despite his Hollywood stature, Selleck leads a remarkably private life. While filming Blue Bloods, he sticks to a disciplined routine, frequently commuting between New York City and his California ranch. Castmates describe him as punctual, respectful, and an anchor for the entire production. Donnie Wahlberg has even said that Selleck’s presence “sets the tone for the whole show.”
And for fans who love the details, here’s one more: the clutter in Frank Reagan’s office is no accident. Selleck insists on keeping it that way, believing the commissioner should look like a working leader, not a polished politician.
Through professionalism, authenticity, and subtle creative input, Tom Selleck has helped shape Blue Bloods into one of television’s most enduring and respected police dramas.