Capeci writes a column called Gang Land. It has been published in New York Post, New York Daily News, and the New York Sun. Capeci's column Gang Land is now published in his Gangland News website. Since June, 2008 it has been a 'for pay' subscription site.

Capeci has authored several books detailing the inner workings of the New York crime families. In 1993, Capeci and fellow journalist Gene Mustain published the book Murder Machine, an expose of Roy DeMeo and his crew of mafia hit men. Capeci and Mustain coauthored two other books: Mob Star: The Story of John Gotti (1988) and Gotti: the Rise and Fall (1996). Capeci has also written The Complete Idiot's Guide to the Mafia and Wiseguys Say the Darndest Things: The Quotable Mafia. A compilation of columns was published in the 2003 book Jerry Capeci's Gang Land. From 1999 to 2004, Capeci worked as director of communications at the John Jay College of Criminal Justice.