Keitaro Takahashi was born in Kanagawa Prefecture on September 15. In 2002, he debuted as a mangaka with Ordinary in Kodansha's Monthly Afternoon Season Zokan. In 2006, he began the series Jormungand, in Monthly Sunday GX. He was also the illustrator for the Shueisha SD Bunko publication, Tonari no Dopple-san (The Doppleganger Next Door). His favorite movies include Heat, Miami Vice, The Insider, Gladiator, Swordfish, Formula 51, The Killing Fields and The Usual Suspects. His hobbies include photography, toy guns, and collecting military goods.