Jarkko Sipilä is a Finnish journalist and author of the Helsinki Homicide-series. He has written 20 crime novels since 1996. In the signature police procedural -series, his protagonist is Lieutenant Detective Kari Takamaki at the Helsinki Police Violent Crimes Unit.

Takamaki, unlike some Nordic fictional police characters is not a boozing wildcat, but the ultimate professional who directs his team to track down criminals in an organized fashion.

By 2017 Sipila has published seventeen Takamaki-novels in Finnish. Six have been translated into English in the Helsinki Homicide -series. Also, two of his books are available in German and so far one in Italian.

Jarkko Sipila has worked a crime reporter since 1991 and is now is the head of Crime News unit at the Finnish Channel 3 TV News.