About “On Target”
Mark Greaney is an American author known for writing action thriller novels. His most famous series is the Gray Man, which follows the character Court Gentry, an assassin and CIA operative. Greaney also collaborated on novels by Tom Clancy, contributing to the Ryanverse after Clancy's death in 2013. He worked on the series until 2017. His writing focuses on high-stakes missions and detailed military and intelligence operations. (Summary adapted from Wikipedia, CC BY-SA 4.0.)