The following writers have contributed articles to and/or have been interviewed for Informer over the past six years.
- Ryan Artis, book reviewer and interviewer.
- Arthur Bilek, author of The First Vice Lord.
- Deirdre Marie Capone, author of Uncle Al Capone.
- Christian Cipollini, author of Lucky Luciano: Mysterious Tales of a Gangland Legend.
- David Critchley, author of The Origin of Organized Crime in America.
- Scott Deitche, author of The Silent Don: The Criminal Underworld of Santo Trafficante Jr.
- Patrick Downey, author of Gangster City: The History of the New York Underworld, 1900-1935.
- Justin Dugard, organized crime historian.
- Bill Feather, organized crime historian.
- Oscar Goodman, author of Being Oscar: From Mob Lawyer to Mayor of Las Vegas.
- Sandra Harmon, author of Mafia Son: The Scarpa Mob Family, the FBI and a Story of Betrayal.
- William J. Helmer, author of Al Capone and His American Boys.
- Joshua R. Henze, organized crime historian.
- Alex Hortis, author of The Mob and the City.
- Thomas Hunt, coauthor of DiCarlo: Buffalo's First Family of Crime.
- Thom L. Jones, organized crime historian.
- Jeffery S. King, author of The Rise and Fall of the Dillinger Gang.
- Craig Lockwood, coauthor of King of the Sunset Strip.
- Chriss Lyon, author of A Killing in Capone's Playground.
- Rick Mattix, coauthor of The Complete Public Enemy Almanac.
- Arthur Nash, author of Images of America: New York City Gangland.
- Gregory Peduto, writer and historian.
- Rick Porrello, author of The Rise and Fall of the Cleveland Mafia.
- Ellen Poulsen, author of The Case Against Lucky Luciano: New York's Most Sensational Vice Trial.
- Marina Riggio, genealogist, contributor to articles.
- Angelo Santino, organized crime historian.
- Gavin Schmitt, author of Images of America: Milwaukee Mafia.
- Richard Shaw, crime historian.
- Martha Sheldon, coauthor of Deep Water: Joseph P. Macheca and the Birth of the American Mafia.
- Steve Stevens, coauthor of King of the Sunset Strip.
- Michael A. Tona, coauthor of DiCarlo: Buffalo's First Family of Crime.
- Steve Turner, organized crime historian.
- Edmond Valin, investigative researcher, organized crime historian.
- Lennert Van`t Riet, organized crime historian.
- Richard N. Warner, columnist, reviewer, interviewer, organized crime historian.
