Charles Henle Klein, Jr. (born March 20, 1942), is an American author, best known for writing about police ethics,[1][2][3] and the technique of instinct combat shooting,[4][5][6] He is also a firearms instructor, a former law enforcement officer and a retired private investigator.

[7] From 1979 to 2004, Chuck Klein was licensed as a private detective in Indiana and then Ohio.

[citation needed] In 1992, Klein wrote "America Is Beautiful", which was read into the U.S. Congressional Record.

In 2004, Klein wrote about instinct shooting in his book, Instinct Combat Shooting, Defensive Handgunning for Police as a result of studying police training methods.

Klein is also known for writing The Badge, Stories and Tales from Both Sides of the Law and the autobiographical novel Circa 1957.