Thomas William Selleck is an American actor. His breakout role was playing private investigator Thomas Magnum in the television series Magnum, P.I. (1980–1988), for which he received five Emmy Award nominations for Outstanding Lead Actor in a Drama Series, winning in 1985. Since 2010, Selleck has co-starred as New York City Police Commissioner Frank Reagan in the series Blue Bloods. From 2005–2015, he portrayed troubled small-town police chief Jesse Stone in nine television films based on the Robert B. Parker novels.

Thomas Magnum is the main character on the American television series Magnum, P.I. created by Donald P. Bellisario and Glen A. Larson. The titular private investigator was originally portrayed by actor Tom Selleck from 1980 to 1988, and later by Jay Hernandez in a reboot developed by Peter M. Lenkov.