As a writer, Jon has published over 40 novels with major publishers like Kensington's Pinnacle Books, St. Martin's Press, and many more. He is also the author of eleven installments in the internationally bestselling adventure series Rogue Angel (2006-present) with Harlequin's Gold Eagle line. His short fiction story "Prisoner 392" (appeared alongside Stephen King in FROM THE BORDERLANDS, 2004, Warner Books) earned him an Honorable Mention in 2004's Year's Best Fantasy & Horror edited by Ellen Datlow. Jon has also co-authored two non-fiction books: LEARNING LATER, LIVING GREATER with Nancy Merz Nordstrom (2006, Sentient Publications) and THE COMPLETE IDIOT'S GUIDE TO ULTIMATE FIGHTING with Rich "Ace" Franklin (2007, Alpha Books/Penguin/Putnam).

Jon is perhaps most famous for his Lawson Vampire series of supernatural action novels starring the Fixer Lawson, a jaded anti-hero charged with protecting a race of living vampires from exposure. There are currently six novels (The Fixer, The Invoker, The Destructor, The Syndicate, The Kensei, The Enchanter) two novellas (Slave to Love, The Courier) and five short stories (The Price of a Good Drink, Interlude, Red Tide, Rudolf the Red Nosed Rogue, Enemy Mine) in the series with many more adventures yet to come.

Jon's latest novel is the new Shadow Warrior series debuting in September from Baen Books. Book 1, UNDEAD HORDES OF KAN-GUL is due out September 3rd in stores everywhere.

Jon also publishes his backlist independently. You can find his ebooks on Amazon: http://bit.ly/jonfmerz Barnes & Noble's Nook store: http://bit.ly/bnjonfmerz and on Kobo: http://bit.ly/kjonfmerz

As a producer, Jon has formed New Ronin Entertainment with longtime friend Jaime Hassett to create television and feature film projects in the New England area. Their first project is THE FIXER, a new supernatural action series based on Jon's Lawson Vampire novels. Filming of the pilot begins in 2013.

Jon has studied authentic Bujinkan Budo Taijutsu/Ninjutsu for over twenty years under Mark Davis of the Boston Martial Arts Center. He has also trained with senior Bujinkan instructors both in the United States and Japan. During a trip to Japan in February 2003, Jon earned his 5th degree black belt directly from the 34th Grandmaster of Togakure-ryu Ninjutsu, Masaaki Hatsumi. In addition to traditional training, Jon has also taught defensive tactics to a wide range of clients, including civilian crime watch groups, police and EMS first responders, military units, and federal organizations including the US Department of State, the Department of Justice, and the Bureau of Prisons.

In his past, Jon served with the United States Air Force, worked for the US government, and handled executive protection for a variety of Fortune 500 clients.