Mark Greaney is a #1 New York Times bestselling author. His debut thriller, The Gray Man, was published in 2009 and became a national bestseller and Netflix film starring Ryan Gosling and Chris Evans. He wrote twelve subsequent Gray Man novels that have been released to date. He is also the co-author of seven Tom Clancy novels. His latest book, Sentinel, was released on June 25th, 2024. It is his 25th published work.

Before emerging as a top thriller author, Mark spent 20+ years working as a bartender, waiter and midlevel office worker in his hometown of Memphis, Tennessee. But in his late thirties and after the death of his father, he finally got serious about writing. "I had this amazing epiphany. I was stressed about where I was in life. I didn't have a good position. And I had a lot of social anxiety. I drove a beat-up car. But it came to me one day that I loved to write and I was doing what I loved. And I realized I was successful even if I never got published...And within two years, I was published. And within four years, I was writing with Tom Clancy. And within twelve years, I had a movie out."