Thomas William Selleck (born January 29, 1945) is an American actor and film producer. He is known for starring as private investigator Thomas Magnum in the television series Magnum, P.I. (1980–1988). Before that, he had a recurring role as Lance White, the favorable and naive partner of Jim Rockford (played by James Garner) on The Rockford Files. He also plays Police Chief Jesse Stone in a series of made-for-TV movies based on Robert B. Parker novels. Since 2010, he has also been a primary cast member as NYPD Commissioner Frank Reagan in the drama Blue Bloods on CBS.