Griffin spent his youth in four different countries, learning three languages, and burning all his bridges. Finally settled in Northern California and retired from a day job as a police officer in a major metropolitan department, he lives the good life with his lovely wife, crazy-smart daughter, and needy dog. 1636: Mission to the Mughals, co-authored with Eric Flint, was his first novel. 1637: The Peacock Throne comes out May of 2021. He's also collaborated with Kacey Ezell on a novel set in their Last Stop Station Universe, titled Second Chance Angel. He's also collaborated with Chuck Gannon, penning Man-Eater, the third in the six part first season of Murphy's Lawless.
He has a number of short stories set in different universes coming out in 2021.